Since our mobile phones are already equipped with hardware sensors such as Accelerometer and Gyroscope, we can use it to make a mobile app that becomes a Motion Gesture Controller.
For example, if I hold my phone and make a W gesture in the air, that will trigger the phone to open a WhatsApp. Similarly, we can register and map different motions to different commands for our phone. The gestures you can make and map is entirely up to you.
Other things we can do with it is maybe creating a unique motion that sends an SOS to a buddy. Maybe you are on a blind date and you wanted to bail. You could use this function. Thoughts?