On the lighter side of things, Search Engine Journal is holding a t-shirt competition with many humorous entries. So far, many of the t-shirt ideas revolve around Google and PageRank as can be expected, but some wander off into other areas as well.
You can also check out my entries, number 56 on the list. This contest is a good example of link bait as many sites like mine will be linking to this contest. This winners will receive a free limited edition t-shirt. If you have a few good ideas, why not join in?