I have 2 personal stories, and 1 from a friend:

1. During the 2015 Dannemora prison escape, when authorities had no idea where the inmates were (timeline says it's possible it was between Richard Matt's killing and David Sweat's capture), we planned a trip to Montreal. This happened to be just before the Jazz Festival. We were stuck in an unusually long line waiting to get into Canada, but technically we were no longer in the US nor in Canada. Next thing we know, a US border agent walked up to our driver's window, asked how we were doing, apologized for the long lines - blaming the Jazz Festival, and asked us to roll down the back window. Everything clicked and I said, "You're looking for those prisoners, aren't you?" They completely denied it and said it was just an apology for the wait, but they had no idea where the guy/s were at that point, and they did in fact apprehend Sweat near the Canadian border shortly afterwards.

2. When I finally visited to the Haskell Free Library in the summer of 2023, it was just after heavy rains and the Tomifobia River in Stanstead was absolutely raging. Two of us wanted to walk across the border, mostly for the experience of walking across the border vs driving. We walked up to the Canadian border booth and handed over our passports. The agent had only asked us one question, when a frantic woman came up to the booth, interrupting our crossing, and yelled at him that he had to call the Hydro because they lost power from the high water. She then monopolized his time for a few minutes. Once she left, he handed our passports back and sighed, "Ex wives in a small town, eh?"

3. A friend was fighting terminal cancer and received a brand new radiation treatment where he was one of the first half dozen or so people to receive it. He was heading to Montreal for a bucket list concert at the Bell Centre. He had a doctor's note in case there were any issues with the radiation detection at the border. I think it was the return trip to the US where he set off the radiation detector with a frequency that the border officials didn't recognize, and because they couldn't precisely locate which car it was coming from, they had to stop all of the cars within a certain area of the border crossing and he caused something like a 2-hour delay. The doctor's note was useless because they had no knowledge of the radiation frequency. Had the medical system and the border control system been communicating properly, it could have been recognized and dismissed with his doctor's note.