Something you're just good at with minimal effort and/or you learned much more quickly than average.
For me, it's paper snowflakes. My brain just seems to effortlessly figure out what cuts to make to the paper wedge to make it turn out exactly how I want it. Largely useless, but good fun and was a much-needed ego boost when I was a kid :]
I have really good hand-eye coordination, move very quietly, have fast reflexes, and am good at solving riddles.
I think it sets me up to be talented at a profession which pays very well but is very illegal so it shall go nameless.