He once climbed the Golden Gate Bridge to protest a lumber company.
He's good friends with the Red Hot Chili Peppers.
In addition to being vegan, he also follows a raw diet -- meaning he eats only uncooked foods.
Hootie and the Blowfish wrote a song about him, appropriately titled "Woody."
He won an Emmy and was nominated four other times for his role on "Cheers." He's been nominated twice for an Oscar.
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