A policemen hears a call on his radio that there is an armed robbery in progress. The police converge on the scene. A man with a gun is leaving the store when they arrive. They scream at him to put the gun down but the man points the gun at them. The police shoot and kill him before the robber can get off a shot.
Later they interview the cashier of the store. The cashier says that the man walked up to him and said, this is a robbery. The cashier opened the register, but the man did not take any money. He walks out of the store.
A minute later he walks back into the store and waits by the doors. When the police come, he exits the store.
The police discover that his gun had no bullets in it.
There are a lot of students who commit educational suicide by the method of death by teacher. The kid won't do their homework, won't respond to anything you do, but will respond to the slight provocation. And then one day you ask them "could you please be quiet" or "how are you this morning" and you get back a big "fuck you".
The key is to know not to take it personally. They are not asking you to go fuck yourself, they are asking for you to let them be, they are asking for everyone to just leave them alone.
And you know that you can't do that.