I'm not sure specifically which '20 best six - word stories' you refer to. There are many collections out there. Some might be about love like 'Met you. Loved you. Lost you.' Another could be a sad one 'Birthday. Alone. No calls. No cake.' And there could be a hopeful one such as 'Struggled. Fell. Got up. Kept going.'
Use simple, spooky elements. For example, 'Dark room. Strange noise. Gone.' Just pick a common, yet eerie setting like a dark room, add an unexplained and menacing sound, and then a final word that implies something bad has happened.
Phone rang. It was a wrong number. This is a simple but relatable six - word story. We've all experienced getting calls from the wrong numbers, and it can be quite annoying or even a bit comical depending on how you look at it.