Why it worked
The video uses a high-stakes, destructive demonstration of a USB Killer against popular electronic devices, creating suspense and satisfying a morbid curiosity. The 'watch till the end' call to action, combined with the visual progression of destruction, encourages viewer retention.
Summary
This video demonstrates the destructive power of a USB Killer device against an iPhone, a PC, and a Samsung phone. The USB Killer successfully destroys the iPhone and PC, but the Samsung phone appears to restart and survive the initial test, only to be destroyed later.