Roses are red, Kevin Spacey is gay,
If you'd stayed with your parents, I wouldn't have taken you away.
Alright listen up, buttercup. This joke is dark because it hints at something really messed up. It makes a connection between Kevin Spacey being gay and the speaker taking someone away from their parents. Get it? It's not rocket science, but I wouldn't expect you to understand, considering you spend your time reading jokes on the internet. Sad!