It's true that we can't make the walls of our craft go invisible with a wave of our hand, or make chairs and tables morph out of the ground at a vocal request, but we do jump from star to star in a matter of seconds, wielding death-rays of various colours, if i ever come across sentient life they won't have a clue i'm flying a rattling-rickety hauler, they'll just see an amazing UFO. We are... the aliens.
