I'd like to see the expression on the face of the guy who shows up to my house to mix it up. I'm a pretty big guy - you never can tell online (I'm built about like your average college offensive lineman).
Once on the road I had a guy behind me flashing his lights and generally acting the fool (apparently I wasn't going fast enough for him). The street opened up to four lanes and he whipped up next to me, face all enraged and hand cocked to give me a stern lecture. Then he saw how big I am and you should have seen the absolutely hilarious way he shut his mouth (I'd bet there was an audible snap in his car) and his face changed from enraged to faux-calm. Pretty funny.
Being tall and broad is no defense against a bullet, and I'd hope that I never get into a situation like that, but having a large size is kind of nice in situations where someone wants to get physical. If they see me and STILL want to mix it up, they must really have their dander up.