April Fool's: I haven't played any jokes today. Haven't had to. Calling people up and telling them Mitch Hedberg had died and then letting them struggle over whether I was being serious or not was all the entertainment I needed.

(I honestly am sorry to see him go. His death was extremely pointless--he had so much left to give us, and he wasn't popular enough yet for his death to serve as Belushi-esque warning to this generation.)

Internet April Fool's jokes are becoming more and more popular. Wikipedia has a good comprehensive list of this year's jokes.