Movie where a guy beats up a T.V. then punches another guy's head off when he starts laughing at him?

May be Videodrome (1983)?

Hello, and thanks for responding! Saw Videodrome, oh... maybe ten years ago. While the movie part I described would fit in nicely with Videodrome, being as surreal as that movie is, I'm 95% certain that it is not in that film. Will have to re-watch to make sure, but for the time being, while I'm back here again, might as well also rule out... Altered States (1980) Absurd (1981) Nightmare (1981)