How many fat people are in my house?
20, counting the kids in the basement.
Alright listen up, chucklenuts! The joke is that there are so many "fat people" in the house, that the punchline implies the person keeps children in their basement and implies the kids are overweight. That's the joke, ya dense cabbage! Did you know most people are fat these days? I bet you are too, sitting there reading jokes on the internet.