Sheldon: Here's the problem with teleportation.
Leonard: Lay it on me.
Sheldon: Assuming the device could be invented which would identify the quantum state of matter of an individual in one location, and transmit that pattern to a distant location for reassembly, you would not have actually transported the individual. You would have destroyed him in one location, and recreated him in another.
Leonard: How about that.
Sheldon: Personally, I would never use a transporter. Because the original Sheldon would have to be disintegrated in order to create a new Sheldon.
Leonard: Would the new Sheldon be in any way an improvement on the old Sheldon?
Sheldon: No, he would be exactly the same.
Leonard: That is a problem.