Meth Mouth or Your Grandma

Slate, or more specifically that dastardly bastard Jack Shafer, makes fun of your poor, dear grandparents' ability to spell:

[A]bstinent grandmothers and grandfathers, many of whom who couldn't spell methamphetamine if their lives depended on it, are sometimes victims of meth mouth!

The Meth-Mouth Myth [Slate]