Well, I run around 250 lbs...... but I'm short enough that the drunks look right over the top of my head and pick a fight with you taller guys.
Actually, in my younger days I participated in a lot of street/bar fights and I'd have to say I was looking for more than half of those, but there were certainly many instances of people attacking me without obvious provocation. I just kinda have that "look" I guess.