I've had a few co-workers come over from the UK and Ukraine. We've joked a lot about how Americans don't walk anywhere and I've even warned them to be careful walking because drivers don't ever expect anyone to be walking.

One thing that didn't come up much on MeFi is how religious the average American is. One UK co-worker was a quite astonished when I said that more than half of our office probably went to church almost every week.