When is a go-kart not just a simple vehicle used at the track? When it’s powered by a motorcycle engine. “With buying a business and the extra work involved it doesn’t leave me with much time for a car project at the moment, but I had to do something with the little spare time I’ve got, so I decided to build the kids (me mostly) a go-cart out of that old Kawasaki KZ-650 motorcycle engine that I bought at a swap meet about 15 years ago for $30,” said its creator. Click here to view the first image in today’s viral picture gallery. Continue reading for the five most popular viral videos today, including one showing the 7 dumbest Batman gadgets.