Living in a border city, we cross several times a year from Windsor to Detroit (shopping, sporting events, etc) and each and every time we enter the US my ass puckers up. I HATE entering the states even though I have absolutely nothing to hide... it's brutal.
Vacationing is a pain in the ass too. We usually fly out from Detroit metro, so we always have a hard time in the airport coming back home. They just can't seem to grasp why Canadians from Windsor would fly out of, and into, Detroit.