LOL!!!!!!!
But yes, shake the watch. The junk movement will be very obvious and it sounds like shit. The rotor wind sounds like a cement mixer as Badhobz said. Otherwise, physically, high end replicas will be hard to spot. The obvious part will be the movement.
Edit: This sounds weird but feel the watch with your hands. Feel the metals and get a sense of whether the metals feel awful and start smelling metallic. The replicas I've dealt with have an awful metallic smell and is very rough and not as smooth or refined as a real example.