A new vulnerability reported by some Reddit users shows the iPhone running the latest iOS crashing after playing the video. The video causes the iPhone to go into a loop which causes the iPhone to crash 10 seconds after watching it. The only way to recover from the crash is to press and hold down both the power and home buttons at the same time to perform a hard reset. The iPhone bug is said to crash only the device if the file is sent as a link.
The video below by EverythingApplePro shows the bug crashing an iPhone.
If you're insanely curious and would like to give the video a go, you can grab it from this link.