A user on Imgur shared a bizarre trick showing how a simple text message will cause the recipient’s iPhone to shut down then restart even if they don’t open the text. Unless they’re viewing their message history at the time, the bug will cause their phone to turn off. Here’s what the text looks like:

And here it is in action:

It appears Apple is now aware of the situation and should be working to remedy the problem, so if you’re going to torment your friends, do it quickly.