Electrified
The minds behind the full-body defibrillator believed that one minute attached to this machine equaled "eight hours of hard exercise." This was wildly untrue, and it was also extremely dangerous. The electrical current that ran through the person's body was almost intense enough to stop someone's heart.
Microphoning
Uh... For some reason in the 1940s, people thought that attaching microphones to one's head would make someone's face more youthful and muscular. Yeah, we don't know how to explain this one either.