Ok.. so back in the 80’s I seen this demonic movie w a kid who was slowly becoming a demon, not sure of he was the son of Satan or not but I think he was supposed to choose becoming a demon or staying a boy. After his parents left to go somewhere there was a party at his house with a bunch of demons, I think towards the middle  of the movie he began to change, at one point he began to grow horns… i think the movie may of had some funny parts in ot too.