Sometimes, when I get bored, I look up some passing curiosity on Wikipedia, and then just keep following links within the article that interest me as I delve deeper into trivial pursuit.
Try it sometime.
If you need someplace interesting to start, try the summer Olympics. Did you know that rope climbing used to be a part of the gymnastics competition? Did you know that the U.S. has only won one men's team handball match in Olympic history? Did you know that the only time the U.S. received a medal in lacrosse was in 1908 (a silver; there were only two teams competing)? The trivia never ends!
Also highly amusing/informative: "2012 doomsday prediction," and oh, the places you'll go! I tried this one night and ended up finding that Asylum Entertainment (makers of Megashark vs. Giant Octopus) apparently have a faith-related branch. (I eventually ended up on the page about Candace Cameron, incidentally)
If you're a fan of random trivia, this is your kind of time-killer.