'Fun' is a very subjective thing1.
Some people find puzzles a fun way to spend time, and for those people, we have a page of Puzzling Symbols, for which we have no solutions. So if you fancy a challenge, Puzzling Symbols is the page for you.
Others find 'fun' from hearing (or telling) a good joke. And you know how it is... Somebody tells you a joke, you think it's funny, so you write it down.
Well, these are what we've thought worth writing down.
1 Fun is subjective. BBC news and CNN reported a U.S. Lt. General in Afghanistan boasting "It's fun to shoot some people." This page, however, is about a more civilised form of fun.