Every once in a while someone comes up with an idea so useful that it’s hard to believe no one thought of it before. Wheeled luggage, for example, was the result of a simple premise and has since saved the backs of countless travellers. Unfortunately, in keeping with the law of averages, for every brilliant idea there are a thousand awful ones. Out of that thousand, one or two have misread awful room number and are knocking on the door of insanity. Despite clearly belonging in this last category, the following products are, at the time of writing, all available to buy.