If we do live in a small world (6-degress of seperation), and the government is watching everything we do (Total Information Awareness), they might note that the brother of an acquaintance is a terrorist:
I was completely shocked. They pointed out that Abdullah had signed the lease as a witness. I had completely forgotten that he had signed it for me -- when we moved to Ottawa in 1997, we needed someone to witness our lease, and I phoned Abdullah's brother, and he could not come, so he sent Abdullah.
If you take the inexpensive flight that stops in the U.S. on your way home to Ottawa Canada, you might be interdicted and "renditioned": deported to an ally of the U.S. willing to torture you.