One of my mom's former co-workers had a shoe fetish. She spent much money and time in support of this passion, and was teased for her extravagant collection of shoes.
During a visit to my mom's office, without looking at our feet she was able to recall exactly what style shoe each of us were wearing. Needless to say, I was impressed with this ability.
My own gift is a unique one: I can tell by looking at a person's hands if they've ever had warts (and only on their hands; my special clairvoyance works above the waist). It's nothing noteworthy like finding a cure for cancer or ending world hunger, but it's my strange little contribution to the world.
I admitted this superpower to a group of friends during a dinner party, and ended up being called out on this unusual ability. Everyone placed their hands on the table and I went around the circle and accurately identified the two people out of the group that had ever gotten a wart.
What's your superpower, Internet?