Dover Demon

The Dover Demon is an alleged creature sighted on three separate occasions during a 25-hour period in the town of Dover, Massachusetts, United States on April 21 and April 22, 1977.

The Dover Demon was first seen outside near a bar by three seventeen-year-old boys who were driving through the Massachusetts area when the car's headlights illuminated it. Bill Bartlett, the driver, reported that he saw what he thought at first was a dog or a cat, but upon closer inspection realized that it was a bizarre, unearthly-looking creature crawling along a stone wall on Farm Street.
Bartlett continued to watch the creature, and he reported it to have a disproportionately large, watermelon-shaped head and illuminated orange eyes, like glass marbles. It had long, thin arms and legs with slender fingers, which it used to grasp onto the pavement. It was hairless and had rough, flesh-toned skin, described as tan and sandpaper-like. The creature's appearance was very plain, with no nose or ears, and no mouth was seen. The witness drawings portray its head as having a skull shape, forming the contour of a circle on top with a more elliptical ending projecting down to include where the nose and mouth would be.
Other witnesses have claimed the creature had green eyes and seemingly smooth, chalky gray toned skin, three feet tall, and made a bloodcurdling noise, similar to a hawk's screech combined with a snake's hiss. But all witnesses say it had no ears, mouth, nose, or known sex.
The creature was sighted again an hour later, by John Baxter, 15, and Pete Mitchell, 13, as they were walking home. He said it was bipedal and ended up running into a gully and standing next to a tree. The next day, Abby Brabham, 15, and Will Traintor, 18, driving down Springdale Avenue, claimed to have seen a similar-looking creature from Traintor's car, on the side of the road. Brabham's description matched Bartlett's and Baxter's descriptions, except this time the cryptid had illuminated green eyes. She approximated its height as "about the size of a goat". Investigators attempted to shake up Ms. Brabham by noting she said it had green eyes reflected by car headlights, while Bartlett mentioned orange eyes were reflected back to him by his automobile's lights. Ms. Brabham was steadfast in her description.
Bartlett, Baxter, Brabham, and Traintor all drew sketches of the monstrous sight shortly after their sightings. On the piece of paper that includes Bartlett's sketch, he wrote "I, Bill Bartlett, swear on a stack of Bibles that I saw this creature."

I'm not quite sure whether this would be under Cryptozoology or classed as a alien encounter, because the creature described is very much like the Greys type aliens in most alien witness cases. While this is a strange event, there isn't any evidence other than the group of teenage witnesses testimonies. So it's hard to say, from a cryptozoology point of view i would say that this is a lie or bid for attention by some kids, but if we were to say this was an alien encounter, then it's more possible that this happened. In either case, i can't say what these kids saw that night without more evidence and witnesses, so we have to leave it to an unexplained encounter.