7 sentences that sound crazy but are still grammatical

Believe it or not, this sentence is grammatical: "The rat the cat the dog chased killed ate the malt."

"Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo."
(Image credit: ThinkStock/iStockphoto)

Martha Brockenbrough, founder of The Society for the Promotion of Good Grammar, started National Grammar Day in 2008. Since then it has been held every year on March 4th, a date that also happens to be a complete sentence (March forth!). It is celebrated in various ways: There is a haiku contest, an anagram unscrambling contest, and even an official song.

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Arika Okrent is editor-at-large at TheWeek.com and a frequent contributor to Mental Floss. She is the author of In the Land of Invented Languages, a history of the attempt to build a better language. She holds a doctorate in linguistics and a first-level certification in Klingon. Follow her on Twitter.