A story

The rock seems to vibrate in your hand. The sensation is somewhat relaxing, so you continue to hold the rock. Green scales begin to appear on your hand. You panic and try to throw the rock away, but it is stuck to your palm. The scales continue to spread. They spread up your arm, all over your face, and down your back. Soon you are entirely covered in green scales. Wings and a tail begin to form. Then you are growing, larger and larger, and your neck and face are stretching.

You are a dragon.