This is the face you get when you give the kid the toy he's been banging on about for m-o-n-t-h-s.
In this case, it was a remote-controlled helicopter. We ummed and ahhhed because those things are notoriously hard to fly and quite fragile when you fly them into, for instance, a brick wall.
I videoed the launch and let's just say, the five-year-old was remarkably better at flying the helicopter than the 36-year-old. MUCH better.