Back in the late 90's I saw this scene from a movie or maybe an episode from a tv show.
It was about a couple that goes to a circus/carnival/freak show and I think they see a human snake. I believe they later see a fortune teller/gypsy or one of them might get cursed. I think that after that, they go to the woods and, well "have fun" in the night. What I recall is that either one of them or the fortune teller starts to transform into a snake. I think it was the guy. It did not look like a normal snake, but I remember still having human face with snake features.
I saw this scene when I was like 4 yrs old and I was at my aunt's house watching tv late at night and she saw me and turned the tv off. So I don't really recall much of the movie. I was watching Curse II: The Bite, and it kind of woke-up this memory from my childhood.
The movie looked like it was done from late '70s-mid '90s. I only saw like 20 minutes of the movie, before my Aunt got mad and turned the tv off. I have tried to recall stuff from this movie but I can't recall much, just the transformation scene seemed to be painful. It might not have been a snake but a type of reptilian. It's not the movie Sssssss, either.