As I'm moving office, I have to clean my whiteboard. These quotes have been there for a long time and are going to get removed:
"There is more wisdom in humour than there is humour in wisdom" - P Shaw
"Mathematical puns are the first sine of madness" - anon
"Hanging is too good for a man who puns. He should be drawn and quoted" - Fred Allen
"Puns are like mathematics, people claim to hate them and then use them without realising it"
"Humour is something that thrives between man's aspirations and his limitations. There is more logic in humour than in anything else. Because, you see, humour is truth." - Victor Borge