This is a short video showing you how to make a smartphone case out of a balloon. Will it protect your phone's screen from a fall? No clue, but it will completely block the microphone, speaker, headphones, charging port and camera, so that's pretty cool.
Keep going for the video.
Thanks to Capt'n Sub, who made a smartphone case out of a ribbed and studded condom for EXTRA PROTECTION and INCREASED SENSATION. You're weird.