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.
Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock? Penny: It's not "soup," it's "courage." Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup. Penny: How'd you see it? You said you wouldn't look. Sheldon: Sorry. As I told you, the hero always peeks.