Machine which goes "ping"

On the way up to the maternity ward I notice beneath the emergency stop button in the Mater hospital lift,

"unauthorised use of this button effects the working of this elevator"

at least they have a constant supply of people 'qualified' to make the lift work for the staff.

Imminently expecting mother "...but what do I do?"

John Cleese as doctor "Nothing dear - you're not qualified."