The Maury Island Incident
The concept of Men in Black moving quickly to quell reports of alien invasions was not created by Hollywood, but can actually be traced back to several events from 1947. These events center around two men near Maury Island in the Puget Sound. Fred Crisman and Harold Dahl were harbor patrolmen who, while working on a patrol boat one night, claimed to have been visited by flying suacers. The UFOs, they claimed, were donut-shaped, and dropped hot lava/white metal on their boat like a leaking heavy metal album cover.
UFO lore was quickly ascending to popularity in American culture. Sensing a potential opportunity to cash in, the editor of Amazing Tales paid to fly to the duo's home city. While in-flight, he saw nine UFOs zipping across the sky in loose formation. Upon arriving in town, he found a reservation mysteriously made in his name at the hotel. This was enough to convince him there was a sinister conspiracy at work, so it's no wonder he took it at face value when Dahl and Crisman claimd they had been visited by government agents in dark suits.
In 2003, a reporter tracking the incident visited Dahl. During this meeting, Dahl's wife whipped out a knife and pushed it against her husband's face. Dahl promptly confessed that his story was a complete hoax. We can just imagine her pointing a knife at an alien's throat and demanding it renounce its existence.