Joints and Jivers
Joints & Jivers was created one day on /tg/ by some people who had 40 minutes of free time. That's about how long it took for a crude ruleset to be created for a comical 70's blax/exploitation genre game. Characters sport afros, move to the rhythm of funk and kung-fu-chop bad guys trying to sow trouble in their neigbourhood, fuckas'.
Joints & Jivers 2nd Edition is a little more complete. It can be downloaded here.