This video provided by UFO researchers, the Aerial Phenomena Investigations Team based in Maryland, purports to show genuine, mysterious Men in Black. According to the story, these two strange guys came into a hotel lobby in Niagara Falls asking after one of the employees, who had made a UFO sighting report. (He wasn't working that day.)
According to witnesses who saw these men in person, they were dressed identically in black (as you can see in the video). The had very pale complexions, large blue hypnotic eyes, no eyebrows or eyelashes, and possibly wigs for hair. And they didn't blink. They were said to talk strangely "about governments and conspiracies" and scared some of the hotel employees. Watch the video.