Quote from Raj Koothrappali in the episode Spoiler: Gary Dies
Bert: Excuse me, I have an idea. Stuart: Go ahead. Bert: Like I said, this used to be my Geology classroom. It's filled with all kinds of rock samples. Raj Koothrappali: So, we're gonna throw rocks at men with guns? 'Cause if you don't know, rock beats scissors, not gun.