A gentleman I once met told me about the time he had a one-hour stopover in Canada on his way to the U.S. Everyone had to disembark and change planes, so they also had to go through immigration and customs. The official went through all the usual questions with my friend until he got to the part about how long his stay would be. "How long are you staying in Canada?" "One hour." "One hour? Why are you only staying in Canada one hour?" "Because I've been here before."
(From the "Rest" of RHF)