An expression used when something is too impractical to even be considered, but somehow is. Usually used to try and talk someone out of doing something dangerous or stupid.
Frank: Come back in the window, I really don't think you should be jumping off the roof.
Joe: I know what I'm doing.
Frank: No really. This is Mel Gibson Crazy.
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Mel Gibson Crazy
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When you're scheduled lunch period is so late in the day, its practically dinner
Frank: I got my schedule yesterday and they gave me lunch 7th period.
Joe: Dang man thats Dinner Lunch.