I recently asked about the origin of "P.U." in relation to something smelly. It seems likely that it is not actually an acronym, and I thought it might be fun to post a 'competition' to come up with the best suggestion for what P.U. ought to stand for. In other words, let's make it into a backronym! Can we do this as a community wiki? Please?
This is something that would certainly be appropriate in chat. The EL&U chat is actually quite active and fun, so I recommend bringing it up there.
In the main EL&U site, though, I don't think it will work. The closest thing to a "game" question that has been allowed on EL&U is one with an objective answer: e.g. "What's the longest English word that doesn't reuse any letters", and things like that.