Remember that text message which crashed iPhones last year? Apple fixed that pretty quickly, but there's now a new similar prank which uses a video link instead of text to play havoc with your phone.
Someone can send the video link to your iPhone and, if you take the bait, it will gently slow your phone down over about 30 seconds until it stops and freezes altogether.
There's nothing you can do from there, apart from performing a hard reset on the phone. To do that you'll need to hold down the volume and power buttons for a few seconds.
Watch what you press
The top tip is avoid pressing on any suspicious looking video links you're sent, especially one entitled IMG_0942.mp4 from MacDigger.ru.
This may seem like a fun prank that shuts down your friend's phone with no consequences, but it’s currently uncertain where the glitch comes from and whether it will cause any long term damage to your phone.
It will work on devices running iOS 8 software and above, so it's not just current iPhone devices at risk.
It may also be something created by hackers to be able to get information from your phone, so try to avoid pressing the link if at all possible.
To see the glitch in action, check out the video from EverythingApplePro below.