More Writing Prompts

"THIRTEEN WRITING PROMPTS."
Dan Wiencek, McSweeney's Internet Tendency

#1 is "Write a scene showing a man and a woman arguing over the man's friendship with a former girlfriend. Do not mention the girlfriend, the man, the woman, or the argument."

#13: "A man has a terrifying dream in which he is being sawn in half. He wakes to find himself in the Indian Ocean, naked and clinging to a door; a hotel keycard is clenched in his teeth. Write what happens next."

Looks like a pretty good resource. #13 has me wondering: what would happen next? And, how did he wind up on that door?