Big Bang Theory Quote
Raj: Almost any scientific advancement can be used for destructive purposes.
Amy: That's true. Even Einstein's theory of relativity was later applied to the development of nuclear weapons.
Penny: E equals MC squared. Yeah, "E" is energy, "M" for mass and "C" for the speed of light.
Amy: How do you know that?
Penny: Oh, Leonard mumbles it when he wants sex to last longer.
Quote from S09E22 - The Fermentation Bifurcation