Running a jailbroken iPhone, iPad or iPod touch offers many well-documented advantages over stock software, namely the ability to alter the functionality and UX in ways that Apple would simply never permit. But it's not all a bed of roses, of course. Jailbreaks are, after all, the result of developers finding and exploiting holes within the Apple platform, so while the plus points of running jailbroken vs. untouched software may be enticing, you may also be afflicted by nastiness that would otherwise not have reached you. Case in point: a new proof-of-concept tweak that is not only dangerous, but potentially fatal to your device in that, as per the author, it will brick your device irreversibly once installed.