I'm really good at computer keyboard one-handed typing. Got it from holding my dick uh face uh red wine uhh beer uh I mean, beverage, in the other hand all the time.
I'm really good at minesweeper but like, not good enough to win competitions or whatever.
Ive gotten pretty decent at whistling but I only do it when nobody else can hear me
I have an excellent sense of time. No matter the time of year, without looking at a clock and without looking outside of a window to see where the sun is, I can tell you within about 15 minutes what time it is. And in a world where almost everyone has a phone (all of which have super-accurate clocks) at hand, that's an incredibly useless skill.
I can hand write in cyphered text at ordinary speed. I haven't managed to find a use for that skill though...
being able to tell the current temp/humidity usually within 2 degrees F/5%
I can tell exactly how long it will take me to get home during a road trip within 15 minutes without fail no matter how far away I am.
I know how to make sausage from scratch by hand using an industrial-grade sausage maker.
I've had people ask me how that's useless but it really never comes up.