I don't remember the first time I saw the infamous "Goatse" image, but I wish I could forget the thing. I bet these people do too. If you don't know what it is, well, trust me, you just don't. The slide show includes one very abstract representation of it, and really that's as close as you ever want to get. Other than that one cartoonish drawing, that's only vaguely recognizable, the site is SFW.