From the lunar base, Earth disappeared from every window at exactly the same time.
The thing blocking it moved closer.
Isolation makes the twist irreversible. There is nowhere nearby to retreat to when the impossible thing is confirmed.
It follows the house rule: exactly two sentences, with the turn doing more than adding a monster. It changes the reader’s interpretation of the setup.
Mars
We found a human footprint in Martian dust three kilometers from the lander.
Motion Alert
The motion alert showed a woman standing motionless in my backyard at 2:11 a.m.
Face ID
My phone unlocked with Face ID while I was asleep alone in the apartment.
Sleep App
My sleep app congratulated me for finally getting eight uninterrupted hours.
Deleted User
I deleted my dead husband’s account because seeing his name online hurt too much.