Well I don't keep my talent that hidden; you are pretty accurate fashion - I can do the splits AND stuff my feet into my mouth (I'm a dancer!) and I sing too!
Now for my hidden talent or party trick you may call it; I can burp louder than anyone else - ever.
Oh also, I forget names so easily (like in 5 mins) but seem to remember what people were wearing at certain events even if it was 6 years ago....
I'm not a dancer, but I can do splits and stuff my toes in my mouth, as well. I can also pick up coins and other small/light objects, and pinch my husband on the leg (or elsewhere), with my toes. Amazingly enough, my daughter can do the picking-up-stuff-with-the-toes thing, too!