"You are not a [insert religion], you don't need so many crosses" - Teacher

"I'm getting drunk with all the XO (read cross then 0 marks) I'm getting" - Teacher

"Hence the speed of the cue ball is 5000 m s^1" (breaking the sound barrier) - Student

"Sadistic Exam Setter" - Student (in reference to questions adapted from 'A' level examinations)

"Tick Tock Tick Tock" - Student (doodles on the paper but couldn't finish it, Foxtrot style?)

We should start a collection and sell it somehow...

Just for laughs