Football is a funny one. I finally got used to saying football instead of soccer (after too many comments from English people) and now I'm back in the US, everyone flips out if I say football and not soccer. Funny enough, there were some people in London who agreed with me and called it soccer -- my Irish friends. They said this is because to them football means Gaelic football.
As I played soccer as a (watch out Mr Engel) kid, and followed the sport after I stopped playing, I found soccer a very difficult word to let go of.
I have a story, actually. You guys know Paperchase, the card/stationery company? They have a section in a Borders here (in the US) and I saw a card that was about things men do, and one of the things listed was something about 'watching the football.' I thought that was hilarious because due to the different meanings of the word football, this card would be appropriate in the US or UK. I've never heard anyone in the US refer to 'the football,' though. Except me, I guess, ha.