Here's one for you..
I can consciously raise the temperature of my hands.. ( increase bloodflow )
It requires some concentration on my part, and a couple of minutes, but I can make them "feverish"..
Once sat quietly in a room with 2 cats, and "purred" with them.. ( I have never been able to duplicate this feat, and have always wanted to be able to do it "at will".. )
There are two kinds of "mirror" writing. One way has both hands writing the exact same characters at the same time. True mirror will create mirror images of all characters. Since your left is your dominant hand, natural writing with your right hand would "want" to be backwards, so you'd have to make a small conscious push to form letters properly when you write with your right hand.
My mom couldn't comfortably write without the paper upside down & she didn't have the typical lefty wrist bend. Lefties bend their wrists, so they can see what they've written as they go along. It's a symptom of our writing going left to right. If our text was right to left, you'd prolly see hand, wrist positions reversed, though cultures with text reading right to left have another hand position, where the hand is held below the writing in process. Our culture has a heavy bias against lefties.
I think reading upside down is a skill people can learn, as I can read upside down too. I could be wrong though, as I also have an aptitude for recognizing patterns & conceptualizing what things look like when they're rotated.
Can fold tongue, flip tongue, strangle myself with tongue.. can touch base of nose, but not the tip..
Most of us can't do any or many of those things. If you took a class where this topic was part of the curriculum, your teacher would love to have you in their class, as you'd be able to demonstrate things a lot of people have never seen. I think my friend's teacher asked her if she'd come back to show her skill to another class he was teaching. lol
Rolling "R's" is related to language learning. Babies babble in the language they hear, meaning they practice all of the sounds in their native language, before they ever say their first word. My lisp may have been learned, not hardwired, though I have that improper swallow too, which argues against it, as does my brother's lack of the same problem. My area has a strong "Low German" lean in it's American English, which means most of us have no problem doing the German "SCHL" sound combination. People from other areas will pronounce it as "SL". Because Low German predominates here, we don't learn the High German "CH" sound. The Low German pronunciation for "Ich" (means I, as in I did blah, blah, blah) is like "ISH" & High German "Ich" is in a sound I can't describe using any English word. Anyways, you were exposed to enough of that rolled R when you were an infant to have had it added to your baby babble. The rolled "R" is present in other languages, but less pronounced, which is prolly where & how you acquired it.
Raising temperature in the hands is a holistic treatment for migraine headaches & can be taught. Biofeedback is involved & has to do with intentionally changing your internal blood flow enough to offer some relief for the headache. It may work through the placebo affect, though the biofeedback for migraines should also be beneficial for all other kinds of headaches if that was the case & I've never seen it advocated as a strategy for them.
I could never, ever pull off a purrr. I've read that cat's talk to each other in their prt language & their meow is for communicating with us.