Imagine a facility that has not been well maintained. The roof leaks, the supporting concrete is spalling, the suspended ceiling is overloaded with equipment, and maintenance personnel are too busy to know that the ceiling in your office is near the end of its useful life.
You're oblivious to the growing hazard above your head and the assorted behaviors that have allowed it. You decide to get a cup of coffee. As you walk out into the hall, the ceiling falls in behind you. Wow! Were you lucky!