When I've spoken to someone for a while in real life, then I talk to them on the phone for the first time, their voice sounds completely different! Like they're a completely different person. Of course I always get used to it, but for that first phone call or so I can't help but wonder if I'm talking to an imposture... IIN?

But it's also fun to get them back, especially if they call another family member and I answer the phone.