There are very few things in life I do really well (eating, being lazy, etc.) but out of all the games I have ever played on any system there is a game that I would put money on beating your average (as opposed to world champions and whatnot) player in.
Nintendo 64 - The New Tetris.
Done, you lose. I gloat over a nice pizza.
If you think you can win, bring it
What about you guys/girls? What game do you eviserate all competitors in?