What comedy legend was almost a big-screen Batman villain twice?

What comedy legend was almost a big-screen Batman villain twice?
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Since the days of Cesar Romero gleefully doing crime as the Joker to Adam West's Batman of the '60s, there is a long and storied history when it comes to portraying Batman villains onscreen.

We've seen comedians, serious actors, and everyone in between take up the mantle of bat-foe, from Michelle Pfeiffer to Danny DeVito.  

One famous name narrowly missed out on playing a Batman villain not once, but twice. Who was it?

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