the only time when I did not, was in a really touristic place in NYC. the waiter was a real asshole and shoved our mains down when we were only halfway through our starters.
he got the orders wrong, and was still a pric about it.
I din't tip him, and he called me on it as we were leaving. my response was "I tip usually, quite welll when the service is good..we did not get good service here, and hence no tip".
He then had a crack at us....moron... Mrs.Spanky11 is the editor of a very large travel magazine so she made sure he and his restauarant will not be seeing many scandi customers for a while.