Ceiling Collapse floor is an Interactive floor where the ceiling on the elevator is slowly falling on players' heads. The floor will reward a random person with not just a sandwich, but a Jill Sandwich. DO NOT become like the Jill Sandwich.
Trivia
The sandwich that is given out on the floor differs from what you can buy in the store by the description
There is a small chance that the player can use the noclip to fall outside the elevator