Questions: GM Secret Weapons?

I was watching the most recent Quinns Quest Reviews , covering Stonetop, when I was struck with the most important tidbit of wisdom I've yet heard in the RPG hobby at large. Yeah, that's right. The most important thing I've heard about RPGs ever. Am I being dramatic? Probably. My wife tells me I'm a dramatic guy, and I trust her opinion on me. But one thing that Quinns pointed out made me…