LOL, just looked at my iPhone 5 & think I have an answer...
It's long.
I've driven convertibles forever, and one of the issues that plagues convertibles is that they're less rigid than a coupe, it's because a six sided box is inherently more ridigid than a 5 sided box, for an example, think of an open cardboard box versus one that's been taped shut...
So, we have a 5 sided box in the aluminum body of an iPhone, the volume buttons are the weakest point of the case, and there's enough room to grasp the iPhone above and below the volume buttons and you should have enough leverage to bend it and a new prank has been created:
Find an unattended iPhone 5, and bend it.
How much do you want to bet the people that have bent iPhones are teenagers with malicious friends?