One time I removed the battery rather than answer.
The next time I held down the power button.
There are jokesters that will factory reset your phone if you let them have it. Lesson? Backup your stuff.
As many of you know, some smart phones use the volume button and the power button to take a screen shot. Apparently the Samsung Note 3 uses this to prompt a factory reset, erasing all of the data in the phone without the ability to abort the reset. This happened to me yesterday. Not Happy!!!!!