Word meaning doing something just cause you can or have the abilitity to do it

Question

I'm looking for a word that describes the act of doing something without a real logical reason but just because they can. A example of what I'm talking about would be like this:

The boy hacked the Pentagon just because he could. He didn't steal anything and he didn't want the attention; he just wanted to proclaim his own self-dignity.

What would you call someone like that or the act of doing something like that?

Baiwir · Accepted Answer

Perhaps are you talking about someone who do things spontaneously.
Extreme cases are simple-minded,  autistic or genius.
The root of this behaviour may be intuition, which is more common.
Gratuitously of Graffito seems the best,
or in this example : "you're male... and therefore more innately qualified."

user116295 · Answer

While not a single word, the idiomatic for the hell of it seems to convey your intended meaning quite nicely:

Also, for the heck of it; just for the hell of it. For no particular reason; on a whim. For example, We drove by the old place just for the hell of it. In the first variant, heck is a euphemism for hell. [First half of 1900s]
if you do something for the hell of it, you do it only because you want to, or because you think it is funny I decided to dye my hair bright green, just for the hell of it.

Graffito · Answer

Perhaps gratuitously

Definition: being done in a manner not demanded by the circumstances,
  without apparent reason, cause, or justification.

Example: Seven soldiers on patrol in south area killed an innocent teenager in a gratuitously violent attack using rifle butts, helmets, fists and feet.

Word meaning doing something just cause you can or have the abilitity to do it

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