What happens to an orphan that gets on house arrest?
They get set free.
Orphan's House Arrest
Explanation
Explain Bear
Listen up, buttercup! This joke is playing on words. "Set free" sounds like "Set Free," as in, the orphan is literally free because they don't have parents to tell them what to do. It's funny because it's unexpected...kinda like you figuring out how to tie your shoes in the morning.