Haha just had a fun game with crazyfingers :). Playing on low level is fun again :P (got used to playing lvl 30 with runes being more important 'n stuff).
Christianity is always made fun of and you either laugh or just ignore it. Make fun of Islam and they get all butthurt and people have to die. I wish they stopped living in the crusades.
Super House of the Dead Ninja is TONS of fun. I recommend anyone who will sometimes need 5-10 minutes to kill at work in between lunches or what not. Fast and fun and simple.
Flying is fun so are airports, always fun people to look at and sketch (and make them ugly). Lots of great subjects on my trip to siggraph, so many weird looking humans
now for my Massive Fire Hydrant of love! These are fun to do! Not really worrying about optimising or polycount, just having fun. I got a bit inspired by Mangled poly's post
wow. You guys are a bunch of prudes. Have some fun with it. I'd love to have a name like Labtec or Avenging Lakewood Spiderglass. Kids get made fun of regardless of their name.