Movies
Front- bow, back- stern, if ya don't get it right, I throw your ass out the little round window on the side!
— Quint · Jaws

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A gruff crash course in nautical vocabulary, backed by a threat. Front is bow, back is stern, and getting it wrong means being tossed out of the little round window, meaning a porthole. The comedy is the mix of basic terms and disproportionate punishment.
Context reviewed