Back in 1971 two friends and I were taken into US customs and drilled for some time before they would let us set foot in Canada. (We threw a dart of the state of NY drunk at 3am in the morning and it stuck closest to Buffalo)
After asking if we had anything to declare and I answered "no" Troopers found a case of beer and cat-tails that we collected from side of roads when pissing. We got our beer back an hour later after our return from the Canadian side, but that's a whole nother story.

Here is one now coming IN to the U. S. from Canada.

http://youtu.be/Vo91XS5pVj8

err accepted... you messed up your link :P

One time I was coming up from Florida through Maine and the US border guard asked us where we were from. I said Nova Scotia, and he asked "what state is that in?"

I was on temporary duty with a buddy to Ft. Drum, NY a few years back (pre-9/11 when the big issue was drugs not terrorism).

We had the weekend off and of course it was road trip time. We couldnt be that close and NOT go to Canada. So we jumped in the rental car and took off for the border. No passports needed back then.

In line for the Canadian customs inspection we had some time to examine our situation: A white guy and a black guy. Each with driver's licenses from different states. No luggage. No known destination or contact in Canada other than 'someplace to drink'. In a rental car with Florida plates. A rental car with Florida plates that we had never looked in the trunk of... in a time when rental cars were the popular cocaine mules because local police could confiscate cars when they arrested the drug runners...

It was too late to either get out of line or to check the trunk. Wouldnt help if the drug-dog alerted on it anyway....

The customs agent gave us a pretty strong look but he must have been used to Soldiers because he let us thru. :)

If you guys screw up my liquer smuggling enterprise, I'm gonna be pissed!

one time i landed at a nyc airport from nova scotia. the elderly lady i had been sitting next to on the plane had a tablecloth she apparently bought from a duty free store at the airport. well, we went through the scanners and she caused a bunch of guards to go into high security mode when the scan turned up big scissors inside the folded cloth!

Old woman with scissors! Planted by airport security? Who knows! But if she had gone on a mid air rampage she could have stabbed me. I was so close to being a terrorist victim.

this is important to corroborate that border guard's claims that he catches 3 terrorists a day. i don't know what border crossing he mans, but if it's a popular destination for old women from nova scotia his claim might be legit.

I took a girl to an earth meet (big mistake) in Ohio. When we crossed the border the USA guards lost their mind, they accused her of sneaking into the country to marry someone.

On the way back to Canada its the same old:\

"Welcome back, we've missed you! Go on through"

My experiences with Border Patrol agents have included arguing with them at the same crossing about whether or not they had the power to enforce state law on fireworks (they don't), having an agent note my Cuban cigar fell out of a pocket (he told me he didn't care), and a douchey agent in Miami try to give me lip over who could afford to take a 6 week trip whereupon I replied someone who worked for 6 months straight without a dayoff ahole (he grunted, said be respectful of my position and then said go ahead).