1) Say "I never knew you were a professor"
2) Ask "where did you buy your phd from?"
3) Say "You have got really cracking thighs daddy, er I mean doctor"
4) Say "I fetched a new e.coli sample" then drop a log on his/her desk and promptly wipe your bottom with his/her thesis.
5) Draw a characature of your supervisor on a polystyrene cup, take
it into his/her office, place it on the desk, tell them that its them, then smash it with your fist.