Shortest Horror Story

3 FRIENDS living in a room at 100th floor of the building!
One day LIFT not working...!
So they decided to tell a story for time pass!
They start to walk in steps!
1st person told an action story upto 50th floor!
...
2nd person told a comedy story upto 99th floor!
...
3rd person told most horror story which had only 1 sentence...!
and that is

"I FORGOT THE ROOM KEY IN CAR"