It's me

I noticed recently that just about every message on our machine at home, or on my cell phone, all start with "Hey, it's me." Everyone is "me". I do it too. I didn't realize I did it until I heard a message I left at home. The problem is sometimes I'll hear messages from women who all sound alike. So I have a chorus of It's me's to call back, but no idea who called! That's when it's best just to run through speed dial, calling everyone and saying "Hey, it's me."