A friend of my wife's worked at the USPTO for a few years as a mechanical engineer reviewing patent applications. He said they would regularly get applications

A friend of my wife's worked at the USPTO for a few years as a mechanical engineer reviewing patent applications. He said they would regularly get applications for time travel machines and perpetual motion machines and they would have to spend a bunch of time writing up why it was rejected. It was a right of passage usually reserved for the new guy ;)