If you have the dangerous habit of drinking a lot and then getting behind the wheel, this keychain breathalyzer with a built-in flashlight was designed with you in mind. It lets you figure out just how drunk you are when you're getting in your car, letting you slip by just under the limit. It also has a flashlight on it, allowing you to find those pretzels in the backseat while you're speeding down the highway.
And for $5.99, I'm not sure how much I trust the thing to work properly anyhow. Well, I mean, the flashlight probably works, but I've never heard of a breathalyzer for that cheap.