The Monowheel
What's the purpose of the monowheel, you ask? We're not really sure. Someone had a pipe dream and decided to run with it. It didn't work out too well as there were a lot of mechanical issues. That, and this thing was super expensive to build. This would, in theory, be great for folks who have to travel long distances over farmland or desert.
The Phone Fan
This seems like a silly invention, but when you're six hours into a summer festival with no wind, this would be a lifesaver. Most of these phone fans work by attaching the device to the charging port of your phone. Switch the fan on for a nice breeze! Be wary, though, some fans work better than others.