1) Do not talk loud enough for anyone outside of your own party to hear.
2) If you must rustle about crisp and sweets don't do it during dialogue, pick a noisy moment in the film.
3) If you have a weak bladder or a child sit at the end of the row.
4) No mobiles and that includes reading the text you have received in silence.
5) If the cinema is all but empty do not choose to sit directly behind/in front of / or beside those who are in already.

Please feel free to add!
For the recors I had a very irritating cinema experience last night!