This is a chalkboard with a twist! Write with one finger, and you'll be drawing. Try writing with two or more fingers, and you'll be scratching the chalkboard with your nails!
Most people can't stand hearing the sound of nails scratching against a chalkboard. Sound's like a great way to prank or annoy your friends!
Step 1: Turn up your volume.
Step 2: Show your friends the app while you write with one finger.
Step 3: Tell you're target victim to give it a try with one and then two fingers.
Goal: Watch them get the chills!
Be sure to post you're prank stories!