On my 40th birthday I got a mammogram.
Not as a gift. And not as a celebration, in the way that you might get a tattoo on your birthday, or go skydiving. It wasn't something I always wanted to do. I simply had a routine appointment at Sloan-Kettering in New York, and it happened to be my 40th birthday, and I didn't appreciate the lameness of the timing until the receptionist asked for my date of birth.