Anybody familiar with the U.K. satire magazine Private Eye? They have one of the greatest running jokes going. An embarrassing photo was taken of Andrew Neill roughly 20 years ago, and since then people have written into the magazine with increasingly more elaborate excuses to print this picture again.
It's a crazy idea, but I thought about possibly getting a running joke going. I don't know what would be the perfect embarrassing or hilarious horror-related picture to put up, but if it's amusing enough all people would have to do is come up with an excuse in any thread to print the picture again (ie: Might you have a photo illustrating the disadvantages of camping in the woods?)
If anybody is interested, just put up a photo that might work well.