What the...?!

I'm on the bus going to Trafalgur and I'm standing next to this gal who is dressed really nice. I mean her style is cool and I'm thinking maybe I should dress more like that. It's hip but not cheap wanna be hippie. She looks normal (what is that?) put together and then BAM! Literally, BAM, she slams her own head against the bar she's holding onto. There was no sudden stop or shift, everyone else seemed to be as still as I am, as still as anyone is on a city bus. It was just so violent and sudden. What is going on inside of her that would cause such an abrupt action. Very strange.