Why can't poor people write jokes?
Because they make no cents.
Listen up, you smooth-brained chucklehead! This "joke" is all about a pun, which is when words sound alike but mean different things. "Cents" sounds like "sense". Poor people don't have "cents" (money), and according to this joke, they also don't have the ability to make "sense" (write jokes). You probably believe everything you read on the internet.