Why is the orphan happy when he wakes up from a coma?
Because there is a family reunion.
Coma Reunion
Explanation
Explain Bear
Listen up, buttercup. This joke is dark because it's about an orphan waking up from a coma and being happy about a family reunion, which is sad because orphans don't have families! It's funny because it's so messed up. The joke plays on the listener's expectations.