I just read this on boingboing.com this morning so I have not had an opportunity to test it. Many a morning has been spent in frustration as the hotel elevator taking me to breakfast stops at each floor to pick up every guest on his way to check-out.

HOWTO put an elevator in express mode without a key
This elevator hack sounds pretty cool, if slightly evil:
While some elevators require a key, others can be put into "Express" mode by pressing the "Door Close" and "Floor" buttons at the same time. This sweeps the car to the floor of your choice and avoids stops at any other floor.

I wouldn't do this routinely, but one does find oneself occasionally on the top floor of a heavily occupied high tower with a need to get to the bottom quickly. One might be tempted to try.