You can't go 5 minutes on the web today without tripping some sort of an April Fools' mine, but even armed with this knowledge, I walked right into this one.

[EMBED_YT]https://www.youtube.com/watch?v=e4oYd5ANw4M

[/EMBED_YT]

Ringtones, notification sounds... There were no survivors. Damn you, @ciwrl!

Edit: So very sneaky.