When in Rome do as the Romans do...well almost

So just a side note. We've been going to the little coffee and pastry shop in the morning. All of the tour books suggest that Europeans do not tip (or expect to be tipped) in the same manner that we do in the US. So we've been leaving a little. But one morning I just forgot and did our standard US tip (so approximately 20%). The woman said thank you and then when she thought she was out of my eyesight danced a little jig and was waving at her co-worker. I may not speak Italian, but I know when I've made someone's day! In general, I've decided to tip like I was in the US. Ok, maybe it's not what the Roman's do - but it clearly makes them happy.