Even in a nation that doesn't care about football (up until this year, of course), I've had spoilers fly at my from the most unexpected sources...
e.g. for the Germany vs Argentina match, I recorded it because I didn't have access to a television at the time it was played. I managed to get through an entire party and a day out with friends (making everyone vow not to tell me the result), then on the way home in the car, I was talking to my brother (who's a once-every-four-years football fan) and we were discussing the upcoming England-Portugal match when he says "I want to see England vs Germany"...