In case of a fire, the bowl of the toilet can save you from beeing asphyxiated by the smoke.
When there is a fire, the victims die from asphyxia a long time before they are reached by the fire. Imagine you find yourself on a hotel burning down, you can not escape, and your last refuge is the bathroom. You lock yourself there, but the oxygen is running out.
If you've got a flexible tube or hose, you can survive longer while you wait for the firefighters. Here is how.
Just make sure, you flush properly the toilet before.