I know a guy who walks into a bank with a little glass bottle. He tells everyone it's nitroglycerin. He scores some money off the teller, walks out. On his way out, the bottle breaks, he slips on it and knocks himself out. The "nitro" was Canola oil. I know more fucked-up bank robbers than ones who know what they're doing. I doubt if one in twenty could tell you where the dye pack is. Most bank robbers are fucking morons.
Elmore Leonard