Helpless people on subway trains

As the bus passed a park on the way to work today, I looked out and watched from a great distance what appeared to be a man punching himself repeatedly in the face. Then he turned his head and spat and I realized he wasn't puching himself in the face at all, he was actually brushing his teeth. I guess his hand was just moving so fast I couldn't see the toothbrush.

Personally, I liked it better when I thought he was punching himself.