Last night on the N29 home, a man got on to the bus and punched a woman who was sat in front of me. He kept screaming 'Don't mess with me' at her and tried to drag her off the bus. Once he eventually left the bus it was apparent that he had broken her nose, as there was blood everywhere.

Once I had gotten over the initial shock of the incident, I felt ashamed that I didn't do anything about it. He would have smashed my face in, no doubt, but still.....

Have you ever been in a position like this when you feel pathetically helpless?