Before Photoshop,

it was often said, 'the camera never lies',

and in this picture it does not, no photoshop, just a normal picture, so what happened to the guys legs?

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the most probable scenario is that, his wife is taking the picture, She is probably sitting on the ground with their son. The daughter isn't too tall, either. So Greg tried to get down on their level by spreading his legs apart, then lowering his head to be even with his daughter's, which meant bending at the hips until his torso was almost perpendicular to the ground. His legs are behind the kids. The shirt hangs a little away from his body, hiding any evidence of pants. So it only looks like he has no legs, I am guessing as this picture goes around the web so many will be trying to achieve the same result!