Some advice I have for if you are in a physical confrontation:
Weird them out
For example, I was walking home late one night, and these two chavs started talking smack to me, so I pointed at a nearby wall and said "That wall is four foot high". They stared at me confused for a second until I then said "The temperature is below 4 degrees tonight". They figured I was mentally retarded or something. Even if the person does know you and knows you are not weird in the head, confusion is a really good way of covering anger. It usually means that instead of punching you in the face, the person just threatens you and tries to get away from you as soon as possible.
Obviously, take this advice with a degree of common sense. If the group is about 6 people big and are really tough and arent just trying to act big, it probably wont do much good
Weird them out
For example, I was walking home late one night, and these two chavs started talking smack to me, so I pointed at a nearby wall and said "That wall is four foot high". They stared at me confused for a second until I then said "The temperature is below 4 degrees tonight". They figured I was mentally retarded or something. Even if the person does know you and knows you are not weird in the head, confusion is a really good way of covering anger. It usually means that instead of punching you in the face, the person just threatens you and tries to get away from you as soon as possible.
Obviously, take this advice with a degree of common sense. If the group is about 6 people big and are really tough and arent just trying to act big, it probably wont do much good