Worst US/Canadian border crossing

Not crossing the border, but used to go through a US highway checkpoint going to and from work everyday...most of the time in a commuter van with other employees. Only bad experience was one lady driving who tried to get smart with them when asked if she was a US citizen. All of us got to sit in the desert heat and wait as a result of that even though they knew us and saw us at the checkpoint every day. Take home lesson there was to just answer the questions asked in a straightforward manner.