A mustachioed hot dog vendor named Donny Franks had some fun at Wrigley Field

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Wrigley Field played host to the Brewers' 11-3 win over the Cubs on Saturday, fresh off Chicago's clinching of the NL Central title.
Before the game, a mustachioed hot dog vendor/hero called "Donny Franks" entertained the masses, which is a phrase that of course means several photo-ops with Cubs personnel: 

So just who is that mystery man who bravely took the mound for a stellar ceremonial first pitch?

Why, he's none other than late-night TV star Stephen Colbert in some wonderful bit of costume magic. Speaking of bit, he kept to this one pretty convincingly: 

His appearance isn't the first mysterious mustachioed gentleman to show up at the Friendly Confines this week ...