Tiger, Tiger
S3, E18: Harm takes his girlfriend's son Josh on a weekend cruise but neglects to tell Annie that the cruise in question is aboard a Navy ship. Josh enjoys pretending that he's an officer in the Navy but when he spots a sinking lifeboat, Harm thinks it's still part of the game. The joke's on him when Josh's story turns out to be true and the lifeboat is revealed to be full of anti-Castro terrorists.
