Originally submitted in the 1980s, this invention was designed to cool down your scalp while walking in the sun. Powered by AA batteries and your dignity, it’s a reminder that even low-tech comfort can inspire a patent. Surprisingly, variations of this concept are still sold today (especially at music festivals and gadget expos).

Turn your biting doggy into a waddling duck.
A South Korean inventor patented this odd-looking pet accessory — a soft muzzle shaped like a duck’s bill. The idea? Prevent dog bites and make your pet look more “approachable” in public. The result? A confused dog, mildly concerned humans, and viral product photos that still circulate online.

A smart toilet that literally knows how you're doing. Filed in the early 2000s, this US patent outlines a toilet system equipped with sensors to monitor your… biological output. It can measure glucose levels, detect dehydration, and even send reports to your doctor. While it sounds dystopian, the idea was ahead of its time — now echoed by modern wellness tech.