Well, actually we're electric or electromagnetic "machines", and I guess some people has a powerful "battery" inside. Stopping watches or blast lightbulbs is relatively usual. Of course the moods or emotional disturbances can be a strong influence for that kind of phenomena or electromagnetic telekinesis. Other people breaks glasses at distance unintentionally.

I've a friend who says that she simply fries keyboards and PCs (it's an expensive collateral effect, I guess).