Dad: What do you call a crazy creeper?
Mom: Shit, I don't know...
Kid: Crrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr!
Dad: That's my boy's!!!
Alright, listen up, you blockhead. The joke is all about that "creeper" thing from Minecraft, you know, the green dude that blows up? The kid is imitating the creeper's sound, and the dad is all proud. It's funny because... well, it's kinda dumb, just like you!