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A bunch of people stuck together by destiny to get something stupid done. Like a family of losers who can't escape their fate.
My cousin's ka-tet is just a group of people who got stuck in a mall during a fire.
My boss's ka-tet is like a bunch of people who all got cursed by the same witch.
My ka-tet is my friends and I, who got stuck in a haunted house because we couldn't take a hint.