Ok, just a crazy idea of mine since I am bored, and arguing with itisali does not amuse me. Imagine universe with nothing in it appart from a single planet, lets say something like earth. Now lets imagine that 100 km above the earth you have a shoe. The shoe has some gravitational potential energy. Now what would happen to that energy if I was to teleport that shoe another 1000 km further from the earth, without using any of the energy the shoe already has. Would it lose some of its gravitational potentional energy? And where would it go? Tachyon.