Spartacus

"...tomorrow I'm showing Spartacus in class."
"Spartacus! The famous snails and oysters scene."
"What does that even mean?"
"Um...what?"
"'Do you think it is moral to eat snails? Or is it only moral to eat oysters? I eat snails and oysters.' What does that mean?"
"Uh..." - a trick question? Missing subtext? So I ventured cautiously - "I thought it was just the sexual innuendo..."
"Oh, is that what it is? I get it. I'm glad you explained it to me."

Whoa. And, whew! I thought for sure I was missing something.