[youtube=http://www.youtube.com/watch?feature=player_embedded&v=vnhzuKcDo6A]

According to Winrumors, you can take out a Windows Phone 7 device (they say various Windows Phone 7s on any carrier) with a single, solitary SMS message with a [redacted at request of Winrumors].  Worse (or better?) yet, it doesn’t have to be a text, it can be a Facebook message or Windows Live chat.

And you don’t just get a reboot.  When your phone comes hobbling back to life, the Messaging hub no longer works.  And other parts of the OS are wonky.

The fix? Hard reset of the device.  Ouch.

In a totally unrelated note, the head of the Windows Phone 7 division was fired today.