Zack: So how's the science world? What are you guys up to?
Howard: We've actually been working on a prototype for a navigation system we invented.
Leonard: But we won't bore you with the details.
Zack: Are you kidding? I love science. Einstein, Stephen Hawking, Mike deGrasse Tyson.
Amy: Mike deGrasse Tyson?
Howard: Yeah, you know, the boxer who grew a mustache and became a scientist.