If you look up the definition of "dirty" in the dictionary, there's a picture of Ty Cobb. The best example is the story about a young pitcher who intentionally beaned him in his first plate appearance. Cobb took his base without saying a word. The next time he came up to bat, he dropped a bunt down the first-base line. When the pitcher went to field the ball, Cobb knocked him over, then spiked him on the chest. The pitcher was sliced open and had to leave the game.