Kid: Why do orphans like tennis?
Dad: Because it's the only time they get "love."
Orphans and Tennis
Explanation
Explain Bear
Alright listen up, buttercup. The joke is a pun. In tennis, "love" means zero points. So the dad is saying orphans only get "love" (zero) when they play tennis. It's dark humor because it implies orphans don't receive any affection.