How many children does it take to change a lightbulb?
Not 15, as my basement's still dark.
Basement Lightbulb
Explanation
Explain Bear
Alright, listen up, buttercup. The joke is that the dude is implying he has kids in his basement. And that he's probably killed them. And you probably get lost on the way to the bathroom. I bet you can't even spell 'onomatopoeia'.