What's the difference between a pile of babies and a Porsche?
I don't have a Porsche in my garage.
What's the difference between a pile of babies and a Porsche?
I don't have a Porsche in my garage.
The joke plays on expectations. You expect a clever comparison, but the punchline is a personal statement about not owning a Porsche. This makes the question seem pointless and creates dark humor.