if i were you i would put things that we see in like some comedy movies...for example....just make sure the humor doesn't take long for people to get.....make stuff that you wouldn't expect to see in an rpg....just think....a real serious moment in the game...like a love scene....and all of the sudden some does something funny or stuff like that...just make the game good and funny....if you make me laugh...then ill say you didn't make this game in vain....well good luck....