Canadians are particularly nasty at the border. I've found that every time I cross. I keep my information exceedingly short and curt, and keep a confident face on.
Having said that I recently arrived at US border without a printout of my return flight handy. I had to boot up my laptop standing at the immigration desk, which seemed to take forever, which gave the guy plenty of time to wander back through my passport and then start quizzing me on previous trips - arrivals, who I travelled with, departures, airlines, etc. It was extremely taxing to answer these questions accurately, knowing he was probing for an answer that didn't match the records on his screen. Finally the computer loaded, I found my PDF itenary and showed it to him. Everything was in order, but the entire ordeal gave him time to power trip on me, all because I didn't print out the travel itenary and slip it into my bag. I won't make that mistake again.
I've traveled to Vancouver, BC probably averaging at least once a year for the last 16 years -- by car and plane. I've always found Canadian customs to be exceedingly polite and friendly -- to the point of joking around even late in the evening/early morning (on a couple of my road trips). That said, coming back into the US, of the roughly 20 trips, I think the US border agents have been friendly once, polite maybe twice, borderline rude/surly the remainder.
Having said that I recently arrived at US border without a printout of my return flight handy. I had to boot up my laptop standing at the immigration desk, which seemed to take forever, which gave the guy plenty of time to wander back through my passport and then start quizzing me on previous trips - arrivals, who I travelled with, departures, airlines, etc. It was extremely taxing to answer these questions accurately, knowing he was probing for an answer that didn't match the records on his screen. Finally the computer loaded, I found my PDF itenary and showed it to him. Everything was in order, but the entire ordeal gave him time to power trip on me, all because I didn't print out the travel itenary and slip it into my bag. I won't make that mistake again.