Travelling.

Strangely, I've never had a problem with US customs, they're always very nice. Canadian customs on the other hand, are often trouble for me.

Coming back from a tech job in Vegas, my friend and I got stopped at Pearson Airport long enough to nearly miss our connecting flight because the customs people were insisting that we must have bought the large electronics, that we had brought down with us, in the US and that we needed to claim them. I've always wondered if this is something all countries do, or if Canada just really hates when people spend money in other countries.