"Some movies inform. Some movies entertain. And some pry open your skull and punch you in the brain."

There were many iterations of the Alien 3 script. One of the more exotic ones was the Vincent Ward & John Fasano "monks in space" script, illustrated here. Looks fantastic.

This is not a list of 'iconic' SFX shots, such as the opening shot in Star Wars or the final shot in Back To The Future, etc. There are many fantastic SFX shots in cinema history that are artistically 'awesome' without qualifying here. For the purposes of this list, a shot has to be either a) exceptionally convincing, b) ground-breaking or c) an exemplary execution of an oft-used technique. Only one shot is allowed per film.