Rolling over?!?!

We think Cooper may be ready to roll over soon.  I put him down on his jungle mat and leave the room for a second and when I return,  he has done a complete 180 turn and I see him look up at me just like this picture.  I think sometimes he is as surprised as I am and I imagine in 5-10 years he will have the same "What did I just do?" look on his face.  I keep saying, he is a gifted baby boy...