If we are making a humourous RPG, then it must be in a world without spaceships. Something more medieval and/or Renaissance-y Why? To joke about something, I usually have to know a lot about a subject, and if you want it to be funny to others, you need a reasonable chance that they know stuff about the subject matter too. You could make a Renaissance crack so funny that you leave a damp patch on your chair, but which means nothing to other readers. The one thing we all have in common is Star Wars, so that would seem like the logical place to start. In the Star Wars...007 series, and when some of the MI5 characters moonlighted in Where the frag is Carmen Sandiego, we've had players interspersing their posts with highly humourous Hitchhikers Guide to the Galaxy and Baldur's Gate references and jokes. Humourous to the posters at least. We didn't even notice them, until they sulked about it months after. Another point , I feel, is if you are doing a Humour RPG, I would recommend NOT putting a limit on OOC usage, as some GMs are wont to do. Like Fanfic writers, comedians need feedback, preferably in the pucblic eye, so PMs would be unsuitable. Writing I regard as funny and coming back the next day to find a laughing smiley relating to my post cheers me up no end.