Depending on your age, you either know Mark Hamill best as the ultimate aw-shucks farmboy-turned-destined-hero-of-virtue (in space) or as the voice of a violent lunatic who kills people for amusement.
Excerpt from Toenail's diary of dysfunctional alcoholism:
"A buddy of mine bought the complete series of the flash on DVD and we decided to make a drinking game out of it. One rule was to take a drink for every mural that was featured. We eventually had to change the rule to every mural that wasn't previously on a earlier episode because otherwise we'd be close to blacking out by the end of the show.
We also had a rule called "Hamill's audition for the Joker" which had us drink for every time Mark would do the laugh. I had to get my stomach pumped because of the last two episodes."