I can spin around and around indefinitely without getting dizzy.

I'm strangely good at catching things intuitively (??).

Like, if my kid throws something at me, I can catch it without looking at it. Almost every time, it's fun

I can solve a Rubik’s Cube in under 15 seconds. (I had an obsessive phase as a teenager). I don’t think I’ve ever used that skill in my adult life, but they are fun figet toys for when I’m stressed.

Back in uni I discovered I can titrate perfectly. Normally you have to do at least 5 or 6 titrations and average the ones that match closest, but I never needed more than 2; A rough titration to get a ballpark figure, then a second to get the exact volume. Any more after that only ever confirmed the first figure.
My professor didn't believe me the first time I came up to her and said my 2 measurements were identical, so told me to do it again in front of her. I produced the same measurement again, and she said she'd never seen anyone do that before, but I'd still have to do at least 3 measurements each time for my coursework.

Unfortunately I've never titrated anything since leaving uni.

I can detect whether apples are "sandy" (or whatever the actual term is for when they have that fugly apple meat that feels like eating sand) or not.

I can make a water droplet sound with my mouth. At first I had to flick my cheek to do it effectively, but nowadays I can do it sneakily without. Great head turner in waiting rooms 😅

I play the drums, but not in a band or anything. It's pretty useless, but I'm glad I got good enough I could just play along with random songs and have fun at home. I didn't stick with any other instrument I've tried to learn, so I'm pretty proud of myself to still be at it after twenty years.

I can handwrite cyphered text as fast as I can write ordinarily. Never have practiced reading the cyphered text though so reading notes that I took in cypher is a pain in the ass...

I'm really good at palming coins and doing variations of disappearing coin tricks. Suck at any other form of slight-of-hand but I can make a coin-sized object look like it vanished with remarkable ease and smoothness.

I can wiggle my little toes independently.

I can clap with one hand. In fact, I can one-hand clap with both hands at the same time!

I can make two sounds that I haven't been able to locate in the IPA chart. They're a voiced and voiceless pair. I can only describe then as the sounds of a goose or duck.

I know the lyrics of Bohemian Rhapsody.

I can bend my fingers between the last phalanx bones