There used to be a site I'd visit but I've forgotten what it's called and can't find it or don't know if it still even exists.
It was a site where you there would be a movie playing through live stream and you could jump in and watch at any time. There'd be others watching and you could comment and talk about the film.
I have a feeling it was like anontheater or something. But I've no clue
There are a few like that, such as https://www.rabb.it/