An optimist would see sushi.
A joke about making the best of a bad situation. The man and the woman are struggling to survive on the island, when a massive shark beaches itself: the sharks looks scary and the man jumps in the water. The woman quips that the man is being unhelpful, and he should instead see opportunity in the shark's presence: they could kill and eat it (sushi). The shark looks pretty intimidating though, so this could be a difficult task.