Am I to assume that extending the middle finger is universal for ... well, you know? =oD

I always take these generalizations with a grain of salt. I suspect some of these "offensive" gestures may be a local issue in parts of those countries and not a sure-fire way to offend every last citizen.

Friggin' Greece. Apparently you need to just walk through that country with your hands in your pockets.

Or is that offensive, too?

How do Greek Football referees tell anyone anything with gestures then? What happens when they get an international referee?