We all have something we can do that serves absolutely no purpose
This post may include affiliate links.
I can cross my eyes very far-it creeps people out. Idk if it's related, but I can also do something with my eyes (like half-cross one?) and it corrects my vision. It's a lifesaver for someone like me who hates glasses and contacts, but doesn't have perfect vision.
Swallowing air to force burps. If yo keep swallowing you can let out some really loud and long burps. The burps you do not let out convert to noisy and unstoppable farts a few hours later.
I can burp backwards. I discovered that when I was drinking hot chocolate and I burped and then I tried to burp backwards and I was fascinated by my disgusting talent.
I'm like really good at kahoots (the quizzes that teachers do when it's almost summer, and nobody has the motivation anymore). I can also make a pretty good owl noise blowing between my thumbs. And I read war and peace once cos I was bored af, so I can talk about that (would'nt recommend unless you have a LOT of time on your hands; it's good, and for someone to have thought up all of that plot and all of those characters is pretty amazing, but its not good enough to warrant ploughing through the whole thing imo)
I have four college degrees in fields i do not work in, do they count? I know how to make fabric, bind books, make shoes, make lace(went to a school in Czech Republic for a month to learn it), And I can 3D model a house