I'm not a big guy but I don't seem to have as much of a problem when I do have confrontations. I just steal their thunder and escalate first. While a lot of people are willing to threaten violence social pressures, especially in confrontational situations, will often prevent people from actually taking that step. So as soon as they start escalating an encounter I'll take it right to the edge of violence and stand there. If they make the next move and actually get violent I make sure I'll be in a self-defense position. I learned it while stealing girls away from dumb jock guys, you let them work the girl up and then you walk in and bully them into giving you the girl. Once or twice I've had punches thrown at me but I can handle that OK, and I'm always the person who gets to say "I was just talking when he decided to throw a punch" Stealing the frame is the psychological key. Oh and Shiz put me down for a mega horn as well, that'll certainly wake up the people parked in bike lanes.