"black hairy tongue"

You heard right: "black hairy tongue." It may sound like something a not-very-imaginative high school freshman would concoct, but the truth is, it's true. Imagine calling in sick: "I'm coping with a wicked case of black hairy tongue..."

Left: A woman's tongue after she was diagnosed with "black hairy tongue." Right: Her tongue after the condition cleared up. (The New England Journal of Medicine)