Actually this happened today.
My teacher is really fat , with really I mean REALLY
So my friend went and bought chocolate (Much chocolate) , he was going to eat it and then she took it and said
"I will give it to you after the lesson"
Well , 30 minutes later when we were supposed to go home our teacher went up to us with chocolate all around her face and toilet paper stuck on it.
So my friend asked where his chocolate is and she said "I lost it , someone maybe took it at the break"
And after that everyone started lauging xD
Not the funniest thing but couldnt think of anything else =(