A tall man sitting behind me at a cinema pushed his leg into the back of my seat, which was very disturbing (or annoying or distracting or uncomfortable) to me.
You might also want to convey the fact that this didn't just happen once, but continually or repeatedly during the film:
A tall man sitting behind me at a cinema kept his leg jammed up against my seat for the entire length of the film. It was so uncomfortable!
I hope this is helpful,
Student or Learner