Favorite variation of chess?

Teary's favorite variation is, oddly enough, one that not many people have heard of:
Alice Chess
http://en.wikipedia.org/wiki/Alice_chess

Checkers
I don't consider checkers a variation of chess.
Chess is a variation of checkers - just flip the board upside-down.
This only works in the Netherlands, and most readers will not even realize what you mean. To them Checkers is a Draughts variant played on an 8x8 board, and when they look on the back of their Chess board, it will just be blank wood. Only on the back of Dutch Chess boards there will typically be a 10x10 board.
I agree that Checkers is not a Chess variant, btw.
My favorite variation of chess is Crazyhouse. What is yours?
Current poll results as of 8/25/2011 5:38 AM PST
Bughouse 9
Dark Chess 1
Crazyhouse 1
Spartan Chess 1
Suicide 1
Losers 1
Alice Chess 1
Hexagonal Chess 1/2
Omega Chess 1/2