What is a weird habit of yours?

Chewing on bottle caps/soda can tabs
Licking things
Cracking my knuckles

Walking into rooms at the worst possible moments

dancing to horrible songs!

chewing my hair ties >_> DONT JUDGE ME! ;-;

I put my tank tops and tube tops on like pants. XD

when i write i lick my lips
i chew my nails
i play with my hair
i purposely step on sidwalk cracks

here is a pic related to the pregunta asker's habit.

I'm constantly looking for negative things in a conversation. It has turned into a bad habit for me now. Fuh.
I tend to el espacio out in class all the time, so I tend to work outside the classroom so that I can concentrate a bit más instead.
Each time I'm singing, I keep constantly changing my voice so that my voice won't crack. Curse puberty, I guess.
I keep hitting my feet/hands in various places. Walls, tables, etc.

Not to mention that I tend to add my own sarcastic comentarios to a really ridiculous conversation, and it constantly results in that I turned into a moodkiller. Hence, why I don't speak anymore.