TVLine has an exclusive behind-the-scenes video feature, in which Callaghan recalls Peter’s letter to The Princess Bride‘s Cary Elwes — and the response he never thought he’d get!
“That episode aired on a Sunday night, and the very next day … who shows up in our writers room but Cary Elwes himself, in person, having written a response,” Callaghan says.
Thankfully, Elwes took it on the chin, and this video contains his entire (hilarious) letter back to Peter.
Watch Callaghan’s video below, then hit the comments: Which of Peter’s countless celebrity interactions has been your favorite? (I’m partial to his Luke Perry seduction.)