I subscribe to Paizo's newsletter, though I must admit that I rarely read it. But the most recent issue's subject line caught my eye with the words Critical Fumble Deck. Now I know that a lot of gamers hate fumbles, but for me they are a cornerstone of Retro Stupid play. A lot of fun can be had tripping over imaginary deceased unseen turtles and accidentally mangling your friends and whatnot.
"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."