 So you're on a boat, right? You're a pirate. You're a big, scary, mean pirate. Maybe you've got a hook for an arm and you're missing one eye. I don't know. A peg leg, perhaps. And you're out there and you're like, well, how do I know how much proof this rum has? Well, pour it on the gunpowder. Does it light it? If it doesn't, and if it's burning slow, that's less than 100 proof. We don't like that. Let's get to the higher point. If we can light that sucker on fire immediately, boom, we've got 100 proof plus, and that's the good stuff. Interesting, right?