25 years ago I drove a cab while in college. Picked up Paul McCartney. It was near my mother's birthday and I called her and he sung her happy birthday.
Edit: He got in the cab and asked to be taken to the stadium. (he was doing a show there that night) I'm looking at him going I know this guy (I was 23 at the time, never expected a celeb in my cab in Cincinnati). When I realized who he was, I asked to be sure, and he laughed. I mentioned my mom was a huge fan and asked him if he would do it. He asked which birthday song I wanted him to sing his or the other one. I chose the other one.
I had a Bag phone in the car, I think it might have cost me a small fortune for that call but totally worth it. If only I had had a modern phone for the camera.