Well, the 'silent calls' with "----" on the caller ID, for one thing. You sometimes get the silent calls when you start sticking your nose into something that someone out there wishes you wouldn't. I used to think it was just coincidence until I talked to a few other FReepers who've experienced the same thing. I have an unlisted number that we guard stronger than Fort Knox, so go figure.
Oh.
Well, I guess that explains a bit of paranoia...