Johnston is Pure Aggression
When you think pure aggression, you might think of 1986 Main Event champ, Berry Johnston. In a recent hand, action folded to Johnston in the cut off and he put in a raise to 375, which was called by the big blind.
The flop came 
and the big blind checked. Johnston, with the force of a hurricane, threw in a bet of 400. The pressure appeared to be too much for the big blind, who mucked. Johnston is up to 4,800.