Use APKPure App
Get Hair on screen old version APK for Android
Put a hair inside friend's phone screen!
Make a funny joke by putting a black hair on the phone screen. It will be always visible on the screen, so victim will think that the hair is under the screen layer. Your friend will think that this is a real hair which lies under the glass and he will try to remove it. Of course it's impossible, because the hair is virtual and you can only hide it by clicking on notification.