Bob, why are you kicking the kids?
What, it's not like they have a home to go to.
Alright listen up, smarty pants! The "joke" is that Bob is kicking orphans, see? And when someone asks why, he says it doesn't matter 'cause they don't have homes anyway. It's funny 'cause it's mean! You are probably too dumb to understand this, because you strike me as the kind of person who eats crayons for fun.