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Jimmy Kimmel did his entire show last night as Jay Leno. Prosthetic chin and everything.

Jimmy Kimmel did his entire show last night as Jay Leno.  Prosthetic chin and everything.

Jimmy Kimmel Does The Leno Show

Then Chevy Chase showed up as Conan and they had a lisp-off. It&#39;s worth your 38 minutes.

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Jimmy Kimmel Does The Leno Show

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