John Ernst Worrell Keely was an inventor from Philadelphia who claimed to developed a machine that was motivated by a new and hitherto unknown force, based on the musical vibrations of tuning forks and that music could resonate with atoms or with the aether. His demonstrations were good enough to garner significant financial support and public interest, but he was debunked by Scientific American after his death in 1898. That hasn't stopped people from believing in sympathetic vibratory physics (Straight Dope forum discussion) and discussing Keely's other claims (on Pure Energy Systems Wiki). One of the most ardent supporters of Keely's theories is Jerry Decker, operator of KeelyNet, a long-running collection of articles and research on (free) energy, gravity control and other alternative sciences, with a section devoted to Keely.
One of the world's most expensive chocolates expertly debunked. (For maximum awesome, read all 10 parts)
We conclude that the study is entirely without merit and its “results” are meaningless. Remember Florida and those electronic voting machines? Remember those plucky Berkeley grad students who proved something was wrong with the evoting counties? It turns out they were completely wrong.
The day after Thanksgiving is the biggest shopping day of the year in America. False. This and many other popular xmas legends debunked at snopes (also notable: Rudolph the red-nosed reindeer created by the Montgomery Ward store chain).