I rub dust particles
I've had this habit for a couple of years now. I like to rub dust, eraser shavings, powder-like particle things between my index finger and thumb. It gives me kind of a relaxing feeling. Supposedly dust is gross but I still touch it, washing my hands after the rubbing of course. It also depends where it is - if it is in a house of someone I know, I will rub the dust. If it's in some dirty place, or some unfamiliar house, I won't touch it, resisting the urge.
I also like to rub the eraser shavings between my fingers after I erase something. It gives me a good feeling!
Anyone else ever done this? IIN??