Risus is a complete Role Playing Game (RPG) designed to provide an “RPG Lite” for those nights when the brain is too tired for exacting detail. Risus is especially valuable to GMs assembling a quick convention game, or any late-night beer-and-pretzels outing. While it is essentially a Universal Comedy System, it works just as well for serious play (if you insist!). Best of all, a Risus character takes about 20 seconds to create!
“Risus: The anything RPG (Role Playing Game) [1]”
Actually, I had to do a search for “Risus” after seeing this image [2] which was from this series of motivational RPG posters [3] which I got from a mailing list I'm on, to get to the page quoted above.
It does look like it's a fun game and charater creation is simple, although it probably takes a bit longer than just 20 seconds to create a charater (maybe a minute or two). And the mechanics are pretty easy— just role some dice and if the sum meets or exceeds to value picked by the GM (Game Master) you succeed, else you fail. It might not be a good system for a long campaign, but for a one shot or having nothing else to do, it'll do.
[1] http://www222.pair.com/sjohn/risus.htm
[2] http://www.llbbl.com/data/RPG-