My mom was at the airport dropping me off for a flight. She figured she would walk me in and hang out till I boarded so she stayed with me at the gate.
Of course this was pre 911. I pointed out an old neighbor who was at the other end of the room. She saw him and yelled Hi Jack! Hey! Hi Jack! He turned just in time with everyone else in hearing to see my mom get acquainted with airport security.
They weren't real happy but listened to the story anyways. Then they called him over to verify his name and when they asked him he kind of cleared his throat and said his name was John. That is when I learned that Jack is a nick name for John. He then said that some of his friends knew him as Jack! The older security guard said dryly, "Not at the airport they won't any longer."