Sometimes break into character voices when driving or shopping.
Cuss like a sailor when driving, altho I don't road rage.

I probably do all kinds of things but I only pick my nose to get the shit out that builds up in it at work.

Hmm, I just commented on the 'idiosyncratic behaviours' post, but perhaps it's better (or also) suited here...

I have a thing about numbers, pattern & symmetry.
I like to see repeated or sequential number sequence. Bonus if they're palindromes.
I also order sushi (& other things) in even numbers.
I mostly do it for fun and to get a rise out of my friends, or to let them get a rise out if me. ?

Biting my nails, sometimes I hum or sing, but mostly cynicism sarcasm and humor.

Pulling my beard to a point and poking my tongue out when im concentrating.

Biting my nails. I can stop for a little while but as soon as I get a little stressed out I start chewing them down to the point that they bleed

I'm not sure how to define that term "innocuous." I like to play with my hair, but it drives my sister and friends complete insane. I like to tap out the rhythms of things... like I'll hear a rhythm in the washing machine, and I'll tap along and create another rhythm to compliment it. I do the same with the dryer, the dishwasher, a car coming down the road... and it drives those around me insane. So I’m not sure innocuous could really define my habits. I like the though.

I have been accused of humming.