"Darmok and Jalad at Tanagra."
Who said it: Captain Dathon and Captain Picard
A phrase meaning "common enemy." In the Next Generation episode "Darmok," Picard became stranded on a planet with a Tamarian captain named Dathon, whose species only spoke in metaphors, and attempted to learn his language. "Darmok and Jalad at Tanagra" was the crux of their communication.