Ah, it's really tough to say the funniest game because humor changes as you age but some of the games I got the most laughs out of are Conkers Bad Fur day, Penny Arcade:On the rainslick precipice of darkness(whole franchise), portal 1 & 2, basically any sandbox game (because of the many instances of ridiculousness such as in Red Dead when my horse decided to roll around the Mexican desert at break neck speeds just before rolling up a mountain and launching into orbit), games from double fine. I'm sure there's more but those stand out the most.