Appsolutely Stupid: Nail Scratch Chalkboard The Joker January 7, 2015 LOL/SMH/WTF This app is described as a means to prank your friends. If you write on the screen with just one finger it will draw as if you’re really using chalk on a chalkboard. However, if you use two or more fingers to draw then it will deliver the cringe worthy sound of nails on a chalkboard. This app is just terrible, and if you are the type of person to do this to your friends then that makes you terrible. Check it out in the App Store. Leave a Reply Cancel Reply You must be logged in to post a comment.