A classmate of mine got expelled because he thought he would be funny:
When we were on a weeks trip in Florence, he noted that some of those who brought a laptop with them there, didn't shut them off when leaving the hotel.
One day he skipped the trip we were taking, he went to one of their rooms and entered the laptop.
He then wrote a suicide e-mail, and sent it to everybody in the address book...
That caused him such a lot of trouble that if he had ANY absence in ANY lecture or if he did not turn in all of his missing and upcoming projects or did not make his homework, he would be expelled...
And he didn't do what was ordered so he did get expelled.