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GREEN MAN!!

Charlie Day brought out his neon green bodysuit Wednesday night to serve as the PERFECT addition to Arizona State's "Curtain of Distraction" Wednesday night ... and it worked!!

FYI -- The Curtain is what ASU students do to mess with the opposing team's free throw shooters by revealing someone acting like a jabroni as the player is about to shoot.

"It's Always Sunny in Philadelphia" fans will easily recognize Charlie's signature tailgating outfit -- and it proved effective, 'cause the Cal player missed his free throw.