I had one really off the wall one: 

Earthly rockband abducted by aliens, who have been watching Humanity since we started beaming out radio waves and are totally in love with Earth music (because Alien music just doesn't cut it.) They are put to touring all sorts of alien rock arenas where crowds wait with bics in tentacles. The Terrans are subjected to alien super-LSD and consent, while stoned, to probings with alien groupies.

The drummers die a lot but there's a cloning tank. It's not optimized for humanity, so no guarantees on the stability of the clone.

The RP didn't take off, but that was definitely one of my wilder ones. It was also a situation where the [url=http://www.roleplayerguild.com/topics/126324-on-tour-where-no-man-has-gone-before-sci-fi-rock-n-roll-parody/ooc]OOC[/url] was fun as hell to write.

The truth is that if you have a crazy idea, pitch it and see what goes.