So that's why!

You thought that inventers just sat around all day at home (or in the laboratory or workshop) inventing, didn’t you? Well you’re wrong, they have to go to special academies of invention and work for their diploma first. These academies are all over the world and there are more and more being opened as countries like Japan and India catch up and overtake ‘the West’.

Every year there is a special competition in every academy for the first year student inventors. They have to design a device for pouring liquid from a cardboard carton. The winner gets to see their work applied to cartons in their part of the world. Have you ever noticed that these things never work? Juice or milk gets spilled everywhere either in the opening process or in the pouring. Like I said, they are only first year students.