http://www.kanjam.com/ (http://www.kanjam.com/)
My brother in-law just bought this and it is hilarious fun. It's somewhat the same principle as bags or horseshoes, but with a Frisbee.
That looks sick, and the video made me crack up.
It almost looks like there making fun of it...
It looks much easier then shoes, washers, bags etc. Any decent ultimate player or freestyler should be able to knock down a lot of 3's or instant wins.
also my brother and friends play a game like this with putter and practice baskets