It all depends on the body language of the waiter when he/she was removing the plates. You can generally tell when they are trying to shuffle you out of the place or if they kindly ask if you are finished and if you'd like anything for dessert.

I don't really have any preference to how my water is served, all long as it is wet. I am a bit leery about the ice at fast food restaurants, however.

As for other pet peeves, I've started a separate thread on pet peeves we all have.