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The bachelor party—the one last night out or weekend away with the boys before you're a married man—is supposed to celebrate friendship, good memories, and the end of the bachelor lifestyle before the wedding. It's a tradition that dates back to the 5th century BC, and the Spartan night of toasts and lavish meals has (as movies will have you believe), evolved into a night of disaster that starts out fun and ends by almost ruining your life.