Sphinx

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In Greek mythology, the Sphinx was a creature that posed riddles; the term is used to describe something inscrutable or enigmatic.

Appearance

Mentioned once in Four For The Seesaw.

Four For The Seesaw

Season 4 · Episode 13 · S04E13

“These women are inscrutable as sphinxes!”
— Niles

From the same episode and category.

“"The Man Who Came To Dinner." It's about a bad-tempered invalid that moves into these people's house and just drives…”

“your sons were taking us out to dinner and then to the Seattle Rep.”

“"The Rose And The Rapier"?!”

“LET'S VUITTON WITH IT”