We all have 'em. Some catch ping-pong balls in their mouths, others can burp the alphabet, while a chosen few play Golden Tee as well as the very gods do.
Me? I have TWO useless talents (go me!).
The first is the legendary "Spit Trick". Upon consumption of a food or treat with suitable amounts of citric acid (certain Popsicles and frozen treats, some sodas, etc) my spit obtains elastic qualities previously unknown to modern man. I can pick up a quarter a foot or so below with a string of spit and bring it back up to my mouth.
The other? I do perfect Texas and Irish accents, despite being born and raised in SoCal.
It's nice to be able to do things that you'll never need in an emergency.