Today I saw a rumour tweeted by @randomdnd, and immediately thought it would make a fantastic stepping off for a single session of Dungeon World:
You lose her near a desolate prison flooded with giant chuul. The hag said that the Dream Shard of Death was fought here. #dnd
What are you doing?
From here, you can extrapolate the ambiguities in the hook to generate some compost for the game. If you have a D6 closer to hand than a playgroup, use these instead:
Who is she?
- 1-3: a master ironmonger
 - 4-5: the hag
 - 6: a pregnant duchess
 
Lose her?
- 1-3: Lost her trail
 - 4-5: Escaped her chase
 - 6: She died
 
What caused the desolation?
- 1-3: Dragonfire
 - 4-5: Plague
 - 6: Geostationary comet
 
Who was imprisoned?
- 1-3: War criminals
 - 4-5: Heretic scholars
 - 6: A nascent godling
 
The hag?
- 1-3: Grendeldam, mother of trolls
 - 4-5: An accursed warlock
 - 6: Terrestrial boneless lamprey
 
The Dream Shard of Death?
- 1-3: A sentient glaive
 - 4-5: An historic troupe of would-be heroes
 - 6: A gestalt anthropocorpus
 
Fought…
- 1-3: And slain
 - 4-5: And fled
 - 6: But never bested
 
Do you have some grim portents?
No.
Just use a couple of small clocks and extrapolate from whichever thread isn’t being directly addressed right now.