Are you planning a trip to Japan soon? There are certainly lots of incredible sights and experiences that await you, but here's something unexpected that you may come across: mysterious cuts in the sides of milk cartons! Offering a unique insight into Japanese culture, it begs the question - why do they even have these cuts to begin with? Keep reading this post to find out more about these little-known facts and discover an intriguing back-story surrounding the puzzling paper carton slits.