Missed calls

I sort of have a rule that when someone calls me and doesn't leave a message, I won't call them back. My voicemail recording even states that fact. The only exceptions to this rule are when the missed call is from a family member or very close friend. Even then, I sometimes feel justified in ignoring it (I really don't like talking on the phone). But sometimes I receive a call that piques my interest, and it takes every bit of self-control not to call that person back. I got one of those calls today. No good can come from calling this person, so I'm sticking to my guns and ignoring it. My curiosity is killing me though.