I was talking with a woman who worked in my building, and I've known her for 16 years--however, I haven't seen her since they moved my office to another building a few years ago.....
We talked for a few minutes---she helped solve an issue we were having......I thanked her, and when I started to leave, she asked "have we met before?".....
I explained who I was, and she looked very confused.......I pulled out my drivers's license, and said "you may remember me like this"..........she still had a hard time believing it. LOL
I don't think that will ever get old!