f you don't know WHO it is.. let it go to voicemail.
I NEVER take my calls blind.. if it says private I let it go to voicemail... I NEVER pick up a call BLIND...
LOL -- I'm the exact same way. I also ignore e-mails that just say something cryptic, like "Call me," or "Please call me," or "Are you available for a call?" At MOST, I'll reply with "Regarding -- ???"