[xamuel]

Ear rumbling: https://www.reddit.com/r/earrumblersassemble/

Eye shaking: https://old.reddit.com/r/Eyeshakers/

Some of us are born with small frenula of the tongue (or we undergo tongue-tie surgery as kids) and can thus perform Khecari mudra without the traditional self-mutilation used by yoga-masters. https://en.wikipedia.org/wiki/Khecar%C4%AB_mudr%C4%81 This can be useful for cleaning tonsil stones or post-nasal drip, but of course you must do so discretely since people would consider that absolutely disgusting

If you want to read out loud for long stretches of time and you hate taking breaks to catch your breath: you can read out loud while inhaling too! (It feels and sounds super weird though so this isn't very useful in practice.)

And here's a party trick related to OP's super power. Pick a distant object and cross your eyes so as to see it double, preferably with the two doubles distant from each other (i.e., cross your eyes significantly). Then, alternately switch between staring at the left double, and the right double. If you do it right, it will look like your eyes are moving in a bizarre alien way.

[emmelaich]

Here's mine. Look at a patch of grass and ask someone to spot the ant or bug.

It's quite difficult.

But, if you let your eyes go out of focus, the ground will suddenly become alive with movement of all sorts of ants bugs and creepy-crawlies.

[amingilani]

This is the first new thing I’ve learned from this thread. I’m going to try it out!