This sort of thing happens a lot more in the AL than the NL for one simple reason: if the pitcher goes headhunting, he'll likely get the same treatment when he's up to bat. It makes you think twice. But the AL has gotten rid of that deterrent with the designated hitter. The only way to discourage this behavior on the pitcher's part is to have a bench-clearing brawl.

The DH is evil. Discuss.