I can recite pi to 100 digits. I have no useful physical skills other than being able to write backward cursive with my non-dominant hand. Okay, I can also write upside down and backward legibly.
Is this you, by any chance? 
I can carve a wooden chain with a jack knife and piece of soft pine.
In sixth grade, I found a book in a ditch, walking home from school. It was a book on Gregg Shorthand. I carried it home, and after looking at a couple of pages, I thought what the hell. I might as well learn this.
It was pretty easy to pick up. It’s no different from a third-grader learning cursive. I used it throughout school to take notes, but my reading skill is much better than my writing skill. Anyway, I didn’t use it much after that. But any time I do think about it, I can see it all in my head. I haven’t forgotten it.
I can put on lipstick by holding the lipstick tube between my boobs. I learned it at camp.
Wait. …
I’m a guy. I don’t have red hair and I don’t even have boobs. That’s not me. That’s Molly Ringwald who can do that.
Why do I always get us confused?
I third the alphabet backwards, and also in the form of Z A Y B … Why i learnt to do that is something I am still trying to figure out.
I too can cut a deck of cards with one hand. And I can roll a coin across my knuckles.
Juggle three balls, bite my toenails, write mirror writing upside down backwards (I’ve posted the latter before).
I can brew beer, as well as catch food items (goldfish crackers, cheese cubes, etc…) in my mouth when thrown from some distance away. Say up to 25 feet or so.
Do you mean jump out of a car and hit the ground rolling, or drive a car over a ramp so that it rolls? I’m confused.
Among my other useless talents, I have an outie bellybutton that I can “suck in” and make it an inny.
Haven’t done it years. I pulled out a quarter and tried it and after a few cycles it’s going fairly smoothly.
If I had a half dollar (or old UK penny) it would be perfect since my hands are too big for a quarter to be comfortable.
I wiggle my ears all of the time. It freaks people out.
I can spell words in sign language alphabet. I’ve been waiting 40 years to walk into a situation where I’d need it, but so far, no opportunities.
I can do black metal vocals pretty well. That’s a useless skill unless you’re a vocalist in a black metal band.
When I was in eighth or ninth grade, I saw a commercial for Downy fabric softener in which a little boy sniffs at his bathrobe sleeve, and he twitches his nose. The moment I saw that, I thought, “I should be able to do that”, and BAM! I twitched my nose.
Been able to do it ever since.
I can also lift either eyebrow independently of the other. Oddly, though, wiggling both eyebrows in tandem requires definite concentration.
I can and do fix all appliances. Did you know that if your $18 Mr. Coffee fails you can get parts for it? People think I’m nuts to spend time on old things, but I love to solder.
[Malienation], we were apparently separated at birth. Juggling and one-handed card cutting are my only skills.
I’d love to be able to roll a coin across my knuckles.
I can do this. One of the side benefits of extensive movement training in acting school. 
I can play the fiddle solo from “Devil Went Down to Georgia” on my farting hands.
I can perform the beshkan, the Persian Two-Handed Finger Snap.
Yay! Now I can, too! How odd…
I taught myself face-painting in my early teens. I can face-paint faster then almost anybody (around 600 in one 10 hour span). I can also paint with my toes, but slower.