We've seen what it was like to put Leonard's mother and Sheldon's mother in a room together, but what happens when you also add Leonard's dad to that mix? That's gotta be an awkward dinner conversation.
James Earl Jones: Why don't you and your friends come to Comic-Con with me? Sheldon: Really? James Earl Jones: Of course. And San Diego is right across the border from my favorite city on Earth, Tijuana.... where I'm taking you every night! Sheldon: Ay-yi-yi. James Earl Jones: Ay-yi-yi. Bang. Bang.