Preacher
1st time was the worst.  GF (now wife) and I were coming back late to Fargo from Winnipeg, probably around midnight at Pembina.  Heater core in my 80's Ford blew and spew antifreeze throughout the passenger compartment....about 6 PM on a sun evening in the Peg.  Spent 4 hours finding a successful afterhours patch...cut the hoses where they entered the firewall and spliced 'em.

....I'm sure I was filthy, tired a bit cranky...but those border guys were just plain mean.  Wife and I escorted under guard to seperate rooms in the main building.  Stripped to our underwear, clothes gone through, wallets and purses dumped, reclothed, questioned.  Left to sit in a locked room for near 1 hour.  About 1.5 hours later...we were released with nary an explanation.  Our car was pulled over to an inspection lane...every item in it and trunk including floor mats was laying haphazard on the ashphalt.

I objected several times through the process.  Was told rudely to "shutup" each time and pointed towards a sign on the wall.  Now I'm recalling this some 25+ years later....but it read something like this...

You are at an International Border crossing
You are between countries and attempting to enter the United States of America
The USA grants the US Border Patrol the right to hold you for 7 days...
(something along these lines)

After reading the signage I pretty much shut up.  Of course we were clean.  I never saw the GF until I was released.  As we drove off we compared notes and had nearly identical experiences.  Did the usualy outrage thing...about how we were going to call our congressman...blah, blah, blah.  Cooled off by GF and stopped around 3 AM or so for a hotel room.

I still think all these years later...they were just jerking our chain as I'm sure I was a bit of a smartass.  Also was a longhaired hippy looking type, filthy and in a broken-down vehicle.