Looking for an episode (but might not be The Twilight Zone)

I'm hoping someone can help me with this. I have memories of an episode I watched when I was younger (1980's) of a teacher that might have been possessed and was terrorizing a student. I remember they were outside at night time, the teacher was decapitated at one point, but his body picked up its head and continued to go after the student. The head was still talking...

The next day in class, the teacher comes up behind the student who was sitting at his desk, puts his hand on his shoulder. The teacher tilts his head back to laugh, and the camera zooms to his neck and we see his head has been stitched back on.

I went through all episodes of the Twilight Zone, couldn't see a description that matches what I remember. I know it is not Teacher's Aide (just watched it on youtube) but this has become a small obsession of mine.

Now this may be projecting on my part since I only remember vague images, but I think the teacher was a middle aged man with longish (shoulder length), and wore a brown tweed jacket.

Does anyone have any idea based on what I mentioned? It might not be the Twilight Zone, but maybe a similar show.

Thanks all!