This document discusses crazy inventions from around the world. It provides examples of inventions such as a food fan that attaches to utensils to cool food, a radio that can be used in the shower, a "butter stick" that spreads butter like a glue stick, dust-collecting shoes for pets, a self-opening umbrella, heated toilet seats in Japan, capsule hotels in Tokyo, karaoke machines, and a realistic walking hand. The document aims to analyze why these inventions became popular and how people use unusual inventions.