Google beats STW shocker
Hold down the home button (on the front of the phone) and the hold button (on the top right corner of the phone) at the same time.
Don't let them go or else you'll take a screenshot.
If the slider to turn the phone off appears, continue holding both buttons.
After 10 seconds or so, the phone's should go dark.
Then hold down the hold button at the top right until the Apple logo appears onscreen and the phone begins to boot up.