One of my daughters was reading comic books and asked me whether there really are such things as jet packs. I had seen some videos many years ago, but a few mouse clicks later, I discovered that you can actually buy one for $100,000. Here is a video showing you how to fly a jet pack. As impressive as this device is, I can't imagine a family of four flying off in jet packs to have a picnic. And clearly, you won't be able to sneak up on anyone while using a jet pack.