This happened to me like three fucking times in high school. I'd be talking with a friend about a game, or just making some joke that some fucking idiot would overhear and then a few hours later in would walk the police and I'd be carted off to the principle's office to explain that when I said "His cognitive dissonance would cause his head to implode" I wasn't making a death treat. Then they'd threaten to suspend me and I'd threaten to let the local news station know that they're being such colossal idiots and everything would go away.