While it doesn't sound that much fun, I'm guessing that appearances are everything.  In '99 I had a couple of U.S. buddies going to Canada to guide for the summer.  With hair down below the shoulder and beards over 8 inches in length, they looked the hippie/druggie type.  Saw the Canadian border patrol pull all their door panels off, open up the headliner, and take all the tires off.  Fun times.  I guess it pays to vac out your car seats before crossing the border, as they found out later that the border police found a small seed, that appeared to be a marijuana varietal.  Good times!