Television (not a LCD or plasma TV)
1. Turn off the TV.
2. Turn off the lights in your TV room.
3. Shine your flashlight at the TV for about 30 seconds to a minute.
4. Now turn off the flashlight.
5. You should see a glowing spot on the TV where the flashlight was pointed.
A television screen has stuff in it that glows when it's hit with light. That's why you can see the shows on the TV screen. When you shine a light on the screen you cause it to glow for a little bit.