Take a look at the 10 strangest engines ever built. From gas-electric hybrids, to an engine made entirely from paper, these strange engines definitely live up to their name. Some were built under the "just because you can" school of engineering, while others have a specific application that requires incredible weight, vibration, or efficiency issues that would limit tratiditional motors. Take a look at some of these wild creations in the video above. Have you ever seen something like this before?