You can tell them that your smartphone is very advanced and uses a variety of sensors and camera to be able to overexpose the walls.
But remember: it's only a joke.

Features:
- easy to use,
- simple gameplay,
- addictive app,
- universal: both for tablets & phones.

How to use:
1. Open Xray Wall Camera Prank and press START button.
2. Place your phone against the wall and take a picture using the camera in your phone.
3. Select xray-effect and click "Scan".
4. Wait a second and HAVE FUN :)

WARNING:
X-RAY WALL CAMERA PRANK is a joke for fun, not a real X-ray.