Question: I need a power that fits the description below, and I also need to know how the individual described below could come by this power.
The Wielder: An individual (human, around 18 or so) has somehow become full of power. He can unleash this power, though it doesn't matter if he does this by choice or not. All that matters is that it can happen easily. I would like it if there is some sort of reason for it's being unleashed (getting angry, controlled by the mind, etc.).
The Power: This power needs to have the ability to just completely demolish everything. I'm currently imagining it as a sort of shockwave that slams into everything it touches. It doesn't have to be in that form though. It could be a force (like magnetism or light), a pulse or wave (like sound), or really just about anything, as long as it can be unleashed by the wielder. It can spread outwards from a central point, or be a focused beam. Once again, all that matters is that it is very destructive. It has to be able to affect everything (people, buidlings, the ground, etc.). It has to be so destructive, that the individual wielding it has to be considered a walking weapon who must be kept isolated, regardless of his intentions. It does need to be a part of the wielder, not a machine or something (otherwise someone could just take it away).
Where you come in: What sort of a power would this be, and how could it be attained by an 18-year old? He does not have to attain it himself; he could easily be the victim of a failed experiment or the like.
The time: I'm trying to keep this within the current era, though a little futuristic speculation is fine (If we could somehow...). What I do not want is fantasy, magic, or space/aliens type answers. If there is a way to keep this firmly grounded in science, I would like to use it.
I realize this may be somewhat vague, so please let me know what further details you need. Also, please tell me if it is simply not scientifically possible.
P.S. While this individual may sound like a super-hero, I'm trying to make this more of a futuristic premise. Don't think Spiderman. Think Hunger Games.