Okay, where is my mobile? I know I'll ring it then go to the car, pocket, room.... and retrieve it.
So I ring......... and it gets answered:
"Hello"
"Err, you are not me. I am ringing me"
"No, I am not you, it's Zoe"
"Zoe, how come you have my phone?"
"You left it after the lesson"
"Well why didn't you ring me?"
"......... because I only have your mobile number, so I would be ringing the phone in my hand"
"Ah, yes"
"Frank, I am 82 and supposed to be the senile one who needs help. Should we swap roles?"
