However, there seems to be so much at risk, I can’t think of anything funny to say that someone could not see and take seriously. Too much risk of inciting someone.
Oh and to mention something else. During the G8 conference in Toronto, a comedian friend of mine Twittered as the security fence. Once I learned about it - from someone/somewhere other than my friend! - I was quite amused by it, and found the writing very witty. Once my friend revealed it was actually her, I had to give her a standing O.