Why didn't the orphans stay at the park for days? Because they had no one to pick them up.
What's an orphan's best friend? A boomerang because it's the only thing that ever came back.
Listen up, buddy. This joke is so dark, it's like staring into your empty head. Orphans don't have parents, so there's no one to pick them up from the park. Get it? And the boomerang? It comes back, unlike their parents. You wouldn't get it, you think the tooth fairy is real.