Some claim the ever ubiquitous gesture was invented by Los Angeles Dodgers outfielder Glenn Burke. He claimed to spontaneously high-five fellow outfielder Dusty Baker after a home run during a game in 1977 when Baker had his arm raised.
It is said that Isaac Newton invented the cat flap (aka the doggy door). He was said to put two cat flaps on his door, a large one and a small one, for his two pet cats. Yas for cats!
What is assumed to be a Mexican invention was actually conceived by the Chinese. Marco Polo discovered the Chinese fashioning figures of cows, oxen, or buffaloes and stuffed with seeds. They covered them with colored paper and burned the remains. Then people gathered the ashes for good luck for the year.