The free smartphone app is called Oni kara denwa (literally, “the call from a demon” — though oni can also be translated as “troll” or “ogre”) and the name alone would surely scare your child enough! The idea is that you get the call and then pass the phone to them, making them listen and stop whining. Yes, my child is being very naughty again. Here, you can speak to him.” Cue passing the phone to terrified child! In addition to the red ogre, other scary figures are also on call.