So I was listening to Pandora today, and created a music station based on a band I enjoy called Nickel Creek (not to be confused with Nickelback). And one of the groups that played was the "Wailin' Jennys."
Even though there's no legal rank on a pirate ship, everyone recognizes you're the one in charge. Like the rock flint, you're hard and sharp. But, also like flint, you're easily chipped, and sparky. Arr!