Telling someone “KYS” online can be illegal, depending on who you send it to, how often, and what you know about them. Those three letters probably won’t meet the Supreme Court’s definition of a “true threat,” but that’s only one legal theory out of several. The same message can expose a sender to state harassment charges, federal cyberstalking prosecution, felony charges in states that criminalize encouraging suicide, civil lawsuits for emotional distress or wrongful death, protective orders, and school discipline. “It was a joke” is not a reliable defense.
Why “True Threat” Usually Isn’t the Right Question
A true threat is a serious expression of intent by the speaker to commit violence against another person, and it falls outside First Amendment protection.1Cornell Law School. Amendment I Fundamental Freedoms – True Threats “KYS” tells the recipient to harm themselves. It doesn’t communicate that the sender will inflict harm. That mismatch is why true threat prosecutions built on “KYS” alone are rare.
The analysis changes when “KYS” is paired with other language. “KYS or I’ll do it for you” is no longer self-harm instruction; it’s a statement about what the speaker will do. And the Supreme Court’s 2023 decision in Counterman v. Colorado lowered what prosecutors must prove about the speaker’s state of mind. A speaker who “consciously disregarded a substantial risk” that their messages would be seen as threatening meets the standard — intent to frighten is not required.2Supreme Court of the United States. Counterman v Colorado Willful ignorance of how your words land is not protection.
The bigger mistake is concluding that if “KYS” isn’t a true threat, it must be legal. True threats are one route to criminal liability. There are others, and some are more serious.
Federal Charges That Can Apply
Most online messages cross state lines even when both people live in the same town, because platforms route traffic through servers elsewhere. That brings federal statutes into play.
Under 18 U.S.C. § 875(c), transmitting a communication containing a threat to injure another person in interstate or foreign commerce carries up to five years in federal prison.3Office of the Law Revision Counsel. 18 US Code 875 – Interstate Communications The statute covers text, email, social media, and gaming platforms. “KYS” by itself may not amount to a threat to injure, but combined with other threatening language it can.
The federal cyberstalking statute, 18 U.S.C. § 2261A, reaches further. It covers using an electronic communication service with intent to harass or intimidate, where the conduct places the victim in reasonable fear of death or serious bodily injury, or causes (or would reasonably be expected to cause) substantial emotional distress.4Office of the Law Revision Counsel. 18 US Code 2261A – Stalking The statute looks at a “course of conduct,” not a single message. A pattern of “KYS” messages, especially alongside other harassment, can satisfy it.
State Harassment and Cyberbullying Laws
Forty-eight states include cyberbullying or online harassment in their laws. Definitions vary, but many cover electronic communications intended to harass, annoy, alarm, or cause emotional distress to a specific person. A “KYS” message, especially one sent repeatedly or as part of a broader pattern, can fit squarely within those statutes.
These charges typically land at the misdemeanor level, with fines and up to a year in jail. States often escalate when the target is a minor, when the conduct is part of a pattern, or when the sender has already been warned or is subject to a protective order. The charge name shifts by state — harassment, criminal harassment, electronic harassment, aggravated harassment — but the elements are similar: using electronic communication to intentionally cause fear or serious emotional distress.
Encouraging Suicide Laws and the Michelle Carter Case
This is where the exposure gets most serious. A growing number of states have laws criminalizing the act of encouraging, aiding, or advising someone to commit suicide. In several of them, it is a felony with prison time measured in years.
The case that put this issue on the map involved Michelle Carter, convicted of involuntary manslaughter in Massachusetts in 2017 for sending text messages that encouraged her boyfriend, Conrad Roy III, to kill himself. Carter used words alone. The prosecution’s theory was that her repeated encouragement, instructions on method, and pressure when he hesitated constituted wanton and reckless conduct that caused his death. The conviction was upheld on appeal.
Carter sent sustained, personalized encouragement to someone she knew was suicidal — a very different situation from a stranger typing “KYS” in a game lobby. But the principle the case established, that words alone can support a manslaughter conviction when they deliberately push a vulnerable person toward suicide, carries broad implications. Several states have since tightened their statutes. Others already treated deliberate encouragement of suicide as a felony.
Not every “KYS” message triggers these laws. Prosecutors generally look for something beyond a single offhand remark: evidence that the sender knew the recipient was vulnerable, that the encouragement was sustained or specific, or that the sender meant for the recipient to act. “I didn’t really mean it” is a harder sell when the messages are directed at someone in a known mental health crisis, or when the sender kept pushing after the recipient expressed distress.
Civil Lawsuits and Money Damages
Criminal exposure isn’t the only risk. A “KYS” sender can be sued personally for money damages.
The most common civil claim is intentional infliction of emotional distress. The person suing must prove the defendant acted intentionally or recklessly, the conduct was extreme and outrageous, the conduct caused severe emotional distress, and the distress actually occurred.5Cornell Law School. Intentional Infliction of Emotional Distress Courts set the “extreme and outrageous” bar high to keep every rude comment from becoming a lawsuit. Repeated “KYS” messages to a specific person, especially someone the sender knew was struggling, can clear it.
If the recipient attempts or completes suicide, the sender can face a wrongful death lawsuit from the family. These cases are fact-intensive and hard to win, but they get filed, and the potential damages are substantial. The central question is whether the sender’s conduct was a foreseeable cause of the death, and telling someone to kill themselves makes foreseeability difficult to dispute.
Separately, a recipient who is being targeted can seek a civil protective order. Once an order is in place, sending another message is itself a crime in every state, regardless of whether the original messages were independently chargeable.
Students, Schools, and Off-Campus Speech
A large share of “KYS” traffic happens among school-age users on gaming platforms, social media, and group chats. Students face a layer of consequences adults don’t.
In Mahanoy Area School District v. B.L. (2021), the Supreme Court held that while schools generally cannot punish off-campus speech, exceptions exist when that speech causes substantial disruption to the school environment. Serious cyberbullying targeting a classmate, including telling them to kill themselves, is the kind of conduct courts have recognized as falling within that exception. Many state anti-bullying laws explicitly extend school disciplinary authority to off-campus cyberbullying that affects the school community.
School responses can include suspension, expulsion, mandatory counseling, and referral to law enforcement. Behavioral intervention teams can trigger safety assessments. A student reported for telling a classmate to kill themselves can face swift and serious discipline even if no criminal case ever follows.
When “It Was a Joke” Stops Working
The First Amendment protects a wide range of offensive, crude, and unpleasant speech. It does not protect true threats, and it does not protect speech that satisfies the elements of a properly drafted criminal harassment statute.1Cornell Law School. Amendment I Fundamental Freedoms – True Threats Whether a given “KYS” message crosses a line depends almost entirely on context, not on the words themselves.
The factors that push a message toward prosecution or liability are consistent across these different legal theories. Repetition matters. Knowledge of the recipient’s mental state matters. A pattern of other harassing conduct matters. Whether the recipient and bystanders took the message seriously matters.1Cornell Law School. Amendment I Fundamental Freedoms – True Threats And after Counterman, the sender’s claim that they didn’t intend any of it fails if they consciously disregarded the risk of how their words would be received.2Supreme Court of the United States. Counterman v Colorado
“KYS” in a meme among friends who read it as absurdist humor sits in different legal territory than the same three letters sent directly and repeatedly to a person the sender knows is in crisis. The first is unlikely to produce any legal consequence. The second can produce several at once.