Tales of the Bus: I just can't help myself.

I'm standing near the exit of the door, waiting to get off the bus downtown, but we end up getting stuck at a red light.  So I'm standing there, and I feel something on my back. I ignore it.  I feel it again, and move a little bit, assuming I'm just brushing up against someone's bag strap or something (the bus is packed, so turning around to look wouldn't have been easy)  But then I feel it a third time, and turn around because by now, I'm having visions of a rat or something creeping up my back and I really just want to rule out that possibility.

Fortunately, I do not find myself staring into the eyes of a rat, but rather, the eyes of a woman who says to me, "Sorry, I just can't help myself".  I must have just looked at her with bewilderment/confusion/terror because she quickly said, "Oh, you had some hairs on your back, I can't seem to stop myself when I see that on people, I always pull them off for them!"  She said it in a way that almost seemed like she expected me to say thank you, and being in a state of confusion, I think I might have thanked her before running off the bus.