A "group" of unusual agents that always appear dressed in black, and turn up in pairs following alien/UFO sightings to warn the witness to not reveal anything regarding his/her experiences.

The Men in Black always arrive at the individual's home when he/she is alone, within a large black car, the number plate of which is often found to be invalid. The MIB themselves always appear totally expressionless and move jerkily and awkward. Many witnesses claim that the "visitors aren't human at all."

One particularly disturbing example of a visit from the Men In Black occurred on an evening in November 1961. Paul Miller and three of his companions were returning home that evening when they saw what they described as being a "luminous silo" land in a nearby field. After disappearing and reappearing in front of them, the silo then seemed to open up and 2 humanoids emerged from within it. Panic-stricken, Miller aimed at the humanoids and fired his rifle, apparently injuring one of them. On their way home that evening, the 2 men experienced blackouts and appeared to lose 3 hours, an event which terrified them completely.

The next morning however, when Miller reported to work that day, 3 men in black arrived. They claimed to be government officials, and went on to query him about the UFO incident, even though they couldn't possibly know about it. " They seemed to know everything about me; where I worked, my name, everything else" Miller reported. Not surprisingly, Miller didn't dare report this incident for several years following the MIB's visit.