Where does the phrase "Lions and Tigers and Bears, Oh My!" come from?

Well you've probably heard of it before, but where do you remember it from..?

Where does the phrase "Lions and Tigers and Bears, Oh My!" come from?
It is indeed from The Wizard of Oz. It may amuse to know that variations on that chant have cropped up over the years. My favorites being:


Hooker and Pushers and Pimps, how much?!


or


Parents and Teachers and Cops, Oh s**t!!
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Reply:Wizard of Oz, Dorthy said to the cowardly lion I believe.
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Reply:The Wizard of Oz. Dorothy, Toto, the Scarecrow and the Tin Man are just about to meet the Cowardly Lion.
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