You’ve come to the foot of a dark, grimy looking staircase. You can’t see how far up it goes through the darkness, you don’t know how long it would take you to reach the top, or where it goes, or how long you’d have to walk through the disgusting ooze dripping from the steps.

It’s awful. It smells foul. Just standing near it makes you feel disgusting, you should run back and slam that door closed now.