In the dorm cafeteria here, and I'm not sure if it's a Spain thing, a Barcelona thing, or just a Universitat de Barcelona San Jordi thing, it's considered really rude if one person or more leaves the table before the rest of the table is done eating. They bang on the plates and on the cups and jugs of water and go wild. Yesterday someone left the table and we started banging and all the other students joined in with us. Today, a few left and we didn't start it because 2 days in a row would be asking too much. But then they started it today when two people got up. It was a small victory for America.