The ultimate cosmic miscommunication! Two nerds in a bookstore having that classic moment where one says "I like Big Bang" and the other excitedly responds "Me too!" - except they're totally talking about different things. She's referring to the actual cosmic origin event that created our entire universe 13.7 billion years ago (complete with inflation, quantum fluctuations, and dark energy), while he's thinking about the sitcom with Sheldon Cooper and his physics buddies. This is basically the scientific equivalent of "I like The Beatles" / "Oh yeah, I love insects too!" Just your typical day in the life of science enthusiasts trying to date.