twig that's a good link, the part of the brain that govenrs impulse control and consequences/conscience just hasn't formed properly until late adolescence.
I expect a part of him know what he was doing was wrong but another side of him just couldn't resist.
As for 3 year old or 30 year olds doing this yes if a 3 year old of mine did it I'd be chuffed that I had such an entreprenurial, precocious little genious on my hands. If a 30 year old did it I'd think them personality disordered or emotionally and cognitively v immature.