Friday open thread: memorable cinema experiences

The sun shone all day, I can hear birdsong outside my kitchen window, and the bulbs and fruit trees in the garden are starting to flower: dare I hope that spring is finally in the air?

This week's open thread prompt is sparked by my plans to watch the second Dune film in the IMAX cinema in Cambridge tomorrow:

What are your most memorable experiences of watching a film in the cinema?

(These do not need to involve IMAX or otherwise flashy set-ups — viewing a film could be memorable for a whole range of reasons.)

( Both my answers involve films from the Lord of the Rings trilogy )