This Guy Can Read Your Mind [VIDEO]

Grab a pen, some paper and prepare to have your mind blown.

This is totally freaky. How does he do that? I'm assuming that some smart mathematician  figured out this equation....chosen number x 2, add 8, divide by 2, subtract original number will always bring you back to 4; which is probably the case, but it doesn't change the fact that it's crazy creepy.

He guessed my grey, elephant from Denmark. What was yours?