Football Association Cup. (The FA run the leagues here, badly )
Basically all the teams in England (some non-league etc) all play various teams in kind of a knock out tournament.
Today is the third round when the big guns from the Premiership enter the tournament. The third round is notourious for a few upsets (like lower league teams knocking out big clubs).
My team (Aston Villa) are playing Blackburn Rovers today (both premiership clubs, just my luck!) and i'm not very hopeful.
The only football I know anything about is AFL http://afl.com.au/
Its also an egg shade ball but they kick it not throw it.
You probery know of it apparently its getting big over there.