Reminds me of a bit of dialog from The Big Bang Theory, in which Sheldon guesses that someone's name is Mohammed Lee, based on the assumption that Mohammed is the most common first name in the world, and Lee the most common surname.
In reality, there are probably very few people named Mohammed Lee. Similarly, there are few red hammers. Axes on fire trucks, but not many hammers. Red is just the most likely color to pick out of the air, and a hammer is the most common tool everyone's likely to have used.
Quick, name a musical key.