Left finger on trigger, Right hand wrapped around it like it is some sort of hand cannon, rather than a pistol. The writing on the jar/tin is not reversed, thus I think he's a leftie.
Edit: Is this from the infamous potato stabbing video, assuming not mirrored knife in left hand.
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What a sane looking, upstanding, christian young gentleman, I'm sure that he is pleasant to interact with. Observe how tight the collar is, it might explain his obvious retardation, carotid occlusion leading to ischemic hypoxia.