Potato guns and cannons can be a fun, but dangerous, experiments to build and test out, and have you ever seen one with a clear barrel fire through a watermelon. Destin from Smarter Every Day makes a goal of educating his viewers on new things each week, and this time, he takes a look at what happens inside a potato gun. Of course, what would a video about a potato gun be without some awesome slow motion shots of something blowing up? Check it out.