The big, the bad, and the boozed-up: Weight moderates the effect of alcohol on aggression.
-- DeWall, C., Bushman, B., Giancola, P., and Webster, G. (2010) Journal of Experimental Social Psychology, 46 (4), 619-623.

It seems that alcohol reduced the inhibition for heavy men to "throw their weight around" and intimidate others by behaving aggressively