I tried posting before so I hope I’m not double posting.

I don’t remember if this was a movie or an after school special but it was definitely in the 70s.
I remember a boy on a bicycle in a neighborhood alley and a small devil like creature is riding a miniature horse, they are about 15 inches tall. And the creature rides the horse down into a sewer drain. That is all I can remember. I hope someone can help because if wasn’t on TV then I either dreamed it or my brother lived it.

This was in the 70s and may have been an after school special. There was a boy walking or riding a bike down an alleyway through a neighborhood and a small devil riding on a tiny horse road down the gutter and disappeared into the drain. Please tell me this was real and not a dream because if I dreamed it then also did my brother.