Even people who are good for nothing can bring a smile to your face.
For instance, when you push them down the stairs.
Stairway to a Smile
Explanation
Explain Bear
Alright, listen up, buttercup. So, you know how some folks are just plain useless? Well, this joke says even they can make you smile, but not in a good way. It's like, you push them down the stairs, and you get a sick, twisted joy out of it. It's funny because it's dark and wrong, and it's wrong because you are not smart enough to find a better joke.