Reasonable on 22 June 2009
For me, in terms of games written to be amusing, probably the classic Lucasarts adventures - Monkey Island, Day of the Tentacle, Grim Fandango, etc.
I've probably laughed the most in MP titles from TF2 now to Doom back in the day, though - unplanned funny incidents with your friends is always a good laugh.
Try to be reasonable... its easier than you think...
