Because Joffrey, the slapee, is a little bitch and Tyrion, the slapper, knows it, so he smacks the shit out of him.
And it's glorious.
And you should watch Game of Thrones.
lol this explanation just sounds great
Fucking ironic for someone waiting on the chance to pounce on SMASH BROS amiibos, a game all about violence.
I should've been specific: I don't condone waifu violence ;3