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A person who laughs at everything, even when you're being a total idiot and your pants are on fire.
Hey, you're a Mad Sket! I just watched you laugh while your dog ate your homework.
She’s a Mad Sket. I tried to explain math to her and she just giggled and said, 'I’m good.'
He’s a Mad Sket. He laughed so hard when I told him I had a pet raccoon that lives in my sock drawer.