What are some fun 2-player card games?

Question

Please include instructions, and make them uncommon ones, more fun and unusual, the more likley I will give you 10 points!

Answer 1

ok, yu-gi-oh, for instructions go to

http://www.yugioh-card.com/  

and click on your language

and then interactive demo,

neopets, for instructions go to http://www.wizards.com/default.asp?x=neo...

and chaotic,  for instructions go to http://www.chaoticgame.com/

you will have to sign up, but it's free and when you do there's a demo