Being immature and singing stupid songs....sounds right up my alley!!!
----- If I wanted to listen to an arsehole, I'd fart!
Rich could probably make edible Doozer constructions if we asked him nicely enough (and if we asked him really nicely, they might even be completely non-toxic). Set-dress Fort Widleigh (I can't be arsed looking up the spelling, sorry), get NPCs to play the characters from the show, and run it overnight after a brutal combat-heavy game so that sleep-deprivation will combine with the (brightly coloured and horrible) cocktails to create the right sense of semi-blissful madness.
Just for a laugh you could have the same chars in the combat heavy game "play" the fraggles in the second game, like there on a trip of some description ____________________________________
As the old robot saying goes "does not compute"