I once got a call from my mother, who lives in a different state, that someone was calling her looking for me. They'd called a number of times by this point. I returned the call and it turned out to be a recruiter who I had not responded to. The recruiter proceeded to use a lookup service which correlated my mothers phone number to me, which he then used to get in contact with me.

I understand that finding people who do what I do is hard, but that scenario made me sick to my stomach.