What's green and has a thousand nipples?
A garbage bag in the alley behind a breast cancer clinic.
Green Nipples
Explanation
Explain Bear
Listen up, buttercup. This joke is dark, like your future if you keep eating paint chips. The setup asks what's green and covered in "nipples." The punchline reveals it's a trash bag behind a breast cancer clinic, implying the bag is full of removed breasts. Get it? Probably not.