There's always that awkward exchange between people entering and exiting the elevator.

The people leaving have places to be, and the people entering want to get on before the door shuts.

What would happen if the person already on the elevator had no plans of leaving . . . ever?

I have no idea how Rémi Gaillard did this, but it's awesome.  The girl involved really had no choice but to sit and wait to see what would happen next.