He's probably nervous about the dog looking away from the action and is motioning for it to look towards him. Hey may have been given that responsibility and has treats in his pockets too.
Or perhaps his mom just arrived off camera and he's surreptitiously waving to her. Or his coke dealer.
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Building an artificial intelligence that appreciates Mozart is easy. Building an A.I. that appreciates a theme restaurant is the real challenge - Kit Roebuck - Nine Planets Without Intelligent Life
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