
It happened in the bottom of the fifth inning as Cubs pitcher Travis Wood homered to left field. The man tried to protect his wife from getting hit by the ball, but accidentally spilled his beer on her. As the man tried to see where the ball went, his wife "thanked" him by pouring her beer on his head.
Fortunately, both of them were laughing about him afterwards. There's certainly no disputing that the man's wife got her payback.
Video via MLB.