Why did my phone start beeping on its own?

A

AC Question

So I left my phone on my dresser and when out to get a bite to eat and when I came back I could hear a strange sound. I traced the sound back to my dresser, and when I picked up my phone, it was on and a timer was shown with the text:
59:59:59 your time is now up
below this it had a large red (X) with triangles directing me to swipe. I did and my phone seemed fine. This has not happened before, and the only current apps I have are Netflix, Pocket Mortys, Neko Atsume, Daily Motion, and two Futurama apps. Anyone know what is happened?
 

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