Peri: Periderm!

Warren: Uh, um… perihelion!

Peri: Pericarp!

Warren: Peri… cope. No, no, no, I’ve done that one…um, ah, peri… petia!

Peri: Perianth, pericycle, pericithium!

Warren: Oh, that’s so unfair! You win. How can I compete with all those botanical terms?