I need an idea for a horror oneshot. I said I'd run a game

>>50631417
The group is on a cruise.
A storm forms out of nowhere.
The engines die, and the mechanic crew is nowhere to be found.
Random crew and passengers start disappearing.
But the lifeboats are still all accounted for.
And that elderly couple down the hall seems all too cheery about the whole affair.

>>50633632
Damn, that's a good setup.

>>50633632
pretty much this but in the generic sense:
collect all the PCs together on some group activity
isolate them from help
Make scary stuff happen
kill them slowly
constantly repeat one strange thing that is a clue, potentially repeat two things so one is a red herring.

>>50631417
https://www.peginc.com/product-category/one-sheets/

The party are engineers in isolated facility underwater/in space.
A mysterious arrival, someone had an accident and gets shelter in said facility.
Each player has some amount of unique information about the facility, that the others don't know.
The mysterious arrival is a changeling, and 'goes missing'.
Pick a player and hand them a note that says "You're a changeling, devour a crew member and take their form, disregard other objectives".
When the player is successful, the player character 'goes missing', hand the note and previous player's unique information to the next player.
Repeat until everyone is dead, or the changeling is beaten.