Titanic vs Iceberg

The joke is a play on a Pokemon battle. The Titanic, instead of being a ship, is a creature that uses the move "Headbutt" against an iceberg, a natural enemy. This is unexpected because the Titanic was a ship not a pokemon, and it was known for sinking when hitting an iceberg. The punchline comes when the headbutt misses and the Titanic faints, implying the Titanic is weak and can't defeat an iceberg even when attacking.