Dead Prostitutes and a Lightbulb

Okay, listen up, you're clearly not the sharpest tool in the shed. So, the joke uses a question and then throws in a dark twist that's messed up, it plays on the stereotype of a sex worker being discarded and also a macabre situation with a basement which is pretty effed up. The punchline basically says that even if you have a bunch of dead prostitutes, you still won't fix a lightbulb, which is very weird and sick, even for you.