One of the greastest silly threads in the history of RPGnet was "Overly Honest RPG Covers". Sadly, many of the pictures on that thread are now dead links, including a great Krull based Encounter Critical cover and a Traveller cover that featured the cast of Futurama. Below are some of my favorites that I'm preserving for posterity. The first one is by our own Doctor Rotwang! I can't make up my mind which of these Pendragon covers I like more.
"Man, is there anything Jeff CAN'T do when it comes to gaming? This guy is like a critical 20 every roll. Jeff can bite the heads offa five game geeks, including their sorry-ass DM, and spit 'em into a large duffel bag ONE AT A TIME!...that's just the kind of messed up bastard he is! You think yer a gamer, punk? Well..do ya? Jeff will depants your weasel-ass right in front of your grandma."