About 10 years ago I saw some MIB type characters. I was working as a clerk at a police station. I walked up to the receptionist's desk to drop off something, and the receptionist and one of the coppers were watching a car in the parking lot intently. It was a Ford Crown Vic just like what the agency had, the color was a super dark purple almost black. Two tall men were sitting in it, both were so tall that the roofline of the car obscured their faces. Both had really pale skin and their heads and faces seemed clean shaven. Both men stared straight ahead, completely motionless.
The cop said "well boys, looks like we got the men in black out front." We all laughed and went back to work. I came up to the receptionist for something else a bit later and she was genuinely creeped out. She asked if I knew who they were, which I did not. She said the weirdest thing was that she turned her head away from the men and their car for a split second and suddenly they were no longer there, as if they had disappeared. The parking lot was rutted and had lots of loose gravel, any vehicle movement would make a fair amount of noise, especially if the car was going fast. But, they had made their exit in a just a second with no noise at all. Come to think of it, I can't recall the car having any kind of license plate either. In my mental image, the rear of the car just sort of has a flat blank spot where the license plate recess would have been.