What is that?

It has probably been about five years already that Angel has lived with my mother and I, and I must say that one of her most amusing acts happens when she lays down. Most dogs (or so you would think) lay down in a normal position, you know, stomach on the ground, paws out, that sort of thing. But not Angel, over the past five years that we have had her, day after day Angel lays in her favorite corner of the living room. All four legs to the sky, paws suspended in air, top of her head on the floor, and tongue out. Just about everyone I know finds it to be hilarious.
See for yourself. . .

                       *This is not Angel, sadly I do not have a picture of her in the pose.

and just for the record, Angel is a little more extreme with it, 

she prefers to be on her back, completely upside down.