Disaster Strikes! (PWYW)
Disaster Strikes! is a no-prep roleplaying game by Josh Fox. The game allows you to create your own disaster movie. You will create a threat, escalate it to the point of catastrophe, and see who can get out alive. Your Protagonists are the only ones brave, competent and heroic enough to save countless innocent Bystanders from doom.
The game takes about 4 hours to play and the only preparation is for at least one person to read the rulebook, which is a mere 38 A5 pages. You will need playing cards, some tokens or coins and some paper to make notes.