Jon Hamm Hams It Up On 'Sesame Street'

Jon Hamm looked more like Mr. Rogers than the dashing Don Draper when he showed up with a full beard and sweater to Sesame Street. What does this Mad Men star have to teach us?

With the help of his puppet friend Elmo, Hamm, 42, explained the word sculpture and even gave some pretty heavy examples while Elmo finished his masterpiece.

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This is a far cry from his serious role on Mad Men. Check out the adorable video above, and be sure to catch Hamm's AMC show on Sunday nights.