Randomly belting out bits of whatever songs pops into my head...
*Walking along* "But it wasn't a ROCK! It was a ROCK, LOBSTERRR!!!"
Haha, I do this too! It's always the weirdest bits too, like "your battery's leaking, oh no!" or "always a pretty rush down my spppppine, ha!" It's particularly funny when there are no words to the song because it's a modern symphony with a million parts and no coherent tune, so all that comes out is a really retarded whistle that covers over 3 octaves in under 3 seconds and freaks people out.
It may be related to hormones, but there are days when I can't control my face. I end up smiling at strangers, and periodically a HUGE grin comes out of nowhere and I start laughing uncontrollably. It's particularly horrible with acquaintances because it can be interpreted as flirting, or worse, insulting (laughing at them).
I'm a checker. Before bed - doors locked, everything off, coffee ready to go.
I shower in order. Head to toe. If I do something out of order I find myself standing in the water going...did I shave my armpits or not?
Bed. This is probably the biggest quirk infestation I have. I have a synthetic milk blanket. It's huge and heavy. I have to be cocooned in it with my feet wrapped. I like the room to be cool and a fan for white noise. Two pillows. One is a base and one is for my head and I kind of sandwich my arm between them. I sleep on my side and roll up in a ball.
I have food issues too. They are too lengthy to list here.
I'm always cracking my knuckles (or toes, ankles, back, shoulders, elbows, wrists, and neck...)
I count everything in sets of 4. How many breaths I take, my steps, letters I type, etc. 1, 2, 3, 4, 1, 2, 3, 4...constantly, in the back of my head. I don't even notice it most of the time. The right side is odd numbers, the left is evens, whenever applicable.
Biting my thumb or chewing on my sleeves when thinking.