Show up. Get a prompt. Write furiously (or languidly) for 45 minutes. Read aloud. Vote on the best. Fame and fortune of the kind that is positively unbelievable are guaranteed to the winner of this literary contest.
Poetry or prose, realism or rodomontade, sci-fi or satire or suspense or saga -- there is neither thematic prescription nor restriction on whence to draw your inspiration. Your submission is expected to incorporate the prompt. This is typically a short one-line phrase elicited from bartenders, bargoers, or the criminally insane (at the discretion of the organizers). Prompts of times past include "the worst job I ever had," "nothing but watered down drinks," and "but she wasn't my daughter."