Exactly what I was just thinking. I was traveling on a foreign passport (from one of America's closest allies) as a personal guest of one of the most senior legal advisers to the POTUS at the time. Crossing into Canada? Pleasant. Crossing back? Oh. My. God. They lost their shit at me because some members of my family travelling on passports from the same country were in the vehicle behind us instead of with me. This was pre-9/11, and we were all on tourist visas. No idea why it was such a problem for them.