Years ago, pre the use of my passport for my family visits, I was coming back into the US and handed the guard my ID. I'm a federal employee so I just handed her my gov't ID rather than my license (easier to get to than the drivers license). She looked at it and said to me - oh no, wait a minute, are you kidding me? I was like - oh no, what now. She then, through her laughter, pointed out that I was actually wearing a sweatshirt in the picture for my gov't ID, that said CANADA on it. She cracked up and said I should be required to get a new picture taken. The lanyard attached to it has maple leaves on it too. Then we had a lengthy discussion of all the US employees at that border who actually live in Canada and how they were making them all move back to the US (or something like that, it was a few years back).

I could type for hours about interesting US/Canada crossings, given how long my family has been doing that. When I was filling out the forms to get a secret clearance with the US gov't, one section asks you to list travels outside the US. I called my brother, a US federal judge, and asked him what did he do with that section. He said - how many lines? I said 6 or something. He said, put down the 6 most recent trips then.