Who are the Men in Black?
The Men in Black are said to be humanlike creatures who threaten and intimidate UFO witnesses or researchers. Their physical features and behavior are described as odd. Their mannerisms and speech tend to be stiff and formal --somewhat robotic and comical but nevertheless menacing. Theories about who the Men in Black are include government agents or alien androids. Another popular theory is that they are hallucinations experienced by people who may have had a traumatic UFO experience. Others say they are outright hoaxes.
The mysterious black helicopters, like the Men in Black, are said to intimidate UFO witnesses. They are seen flying low over witnesses' homes or cars, but never as landing. Some think they are military surveillance helicopters, while others believe they are UFOs disguised as helicopters. It might be that a witness upset by a UFO experience conflates normal helicopter traffic with something more mysterious.