"I can guess who somebody is by listening to their footsteps and walk, a skill amplified by my particularly sensitive hearing.
Everyone walks in just an ever so slightly different way from each other. There's an odd cadence and pitch unique to everyone's walk. If you wear the same pair of shoes around me for too long, I'll be able to tell if you're close by if you take even just two or three steps.
I realized I had this skill in high school. I had a slightly suspicious friend who enjoyed proving his pickpocketing and slight of hand skills by handing you things he took from your pocket. His first attempt and success on me was his last.
I somehow simply knew he was walking towards me even through the crowded high school hallway. Eventually I started paying attention, and realized he has a particularly unique cadence to his step and his shoes caused these steps to be the tiniest bit higher in pitch than the average shoe step sound. His steps stood out to my ears and I knew to put my hand over my pocket.
It's not particularly useful of a skill, but it is fun to be able to greet someone as they walk up behind me before they've said anything at all. It's a neat and unique trick, but not much else."