Well, I don't have much to offer in this field, but I sure have some of these "hidden" abilities.
All three toddler hidden skills - yep, my Mum is the best mother in the world.
Homework - level 10, I am extremely fast at this
Arcade Machine - level 5, as a kid I spent all my pocket money at the local arcade
Dancing - level 3, I'm a great dancer, especially if the music playing is hip-hop
Foosball - level 4, also, quite good at this
Hacking - level 7, hehe, who would have guessed
But not here, of course.
Styling - level 9, I give a-ma-zing makeovers, so to say
Video Games - level 10, no comment
I believe that's all.
ETA: Club Dancing - highest level possible, also, no comment