"You only use 10% of your brain" is a movie lie. Fact is, you actually use your entire brain.
Adam Rifkin stashed this in Facts
If only Scarlett in Lucy and Bradley Cooper in Limitless could access their entire brain!
Also, guns don't automatically fire when they hit the ground.
So True Lies ... lies?
It does in fact lie. If you watch the video atop this page they have a hilarious bit about it.