I think this would be easy to organize, fun and relatively fast, as well as give most people a chance to participate (i.e. you don't have to be godly to really enjoy). There would just need to be standardized rules and decorated card decks or just glory for prizes.
For those unfamiliar with Egyptian Ratscrew / Ratslap / War / etc, it's basically one of those games where everyone takes turns placing cards down and you slap the pile as fast as you can when certain conditions are met (two cards of the same face value are placed consecutively, the joker is played, etc). But if a special card (Ace, K, Q, J) is placed, the next person has some number of "chances" (card draws) to also place down a special card. So it's part luck (how many special cards you have, mainly), part skill (reaction speed).
More info here: http://en.wikipedia.org/wiki/Egyptian_Ratscrew