A couple of nerdy college students who hope to land jobs in computer security used iPhones to hack into a commercial billboard, played Space Invaders on it for a while, and then sent the billboard's owner a description of how they carried out their stunt. The thrill of their triumph quickly turned to terror for Ivan Petrovic, 21, and Filip Stanisavljevic, 20, as they were lectured by their parents and professors and were summoned to a meeting this week by the owner of the billboard.

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