When Apollo 12 was struck by lightning, data returning to Mission Control was corrupted. Coincidentally, the person sitting at EECOM, John Aaron, was one of the few people at NASA that recognized the corruption and he saved the mission by telling the Flight Controller “Try SCE to Aux.” which was so obscure pretty much no one knew what he was talking about.
And that’s where most people end the story.
The call of changing the Signal Control Module to auxillary was so obscure that quite literally no one in either Mission Control or on Apollo 12 knew what he was talking about … except Alan Bean who just happened to be the astronaut in the seat responsible for that switch. So while everyone else was going back and forth on the radio trying to figure out what to do, Bean calmly flipped the switch and thus Apollo 12 was saved.