1}That scene in "Scanners". I mean, in what other movie does the audience get to see someone's head go klabammo by psychic energies alone?
2}Our first glimpse at the alien in "Alien". Doesn't anybody feel just a bit sorry for John Hurt's character in that scene? I mean, he and the others onboard the Nostromo are having dinner, he starts having what he thinks is indigestion, and moments later Hurt's character, Kane, becomes a human ziplock bag as the alien makes his exit, stage left, from the screen.
3}Hearing Jack Nicholson say "Here's Johnny!" in "The Shining". Need I say more?
Any others come to mind, feel free to add them to the list......speaking of which, what was that creaking noise I heard earlier?
but I'm sure we'll be forgiven for lauding Sin City. What an incredibly brilliant film just showing that the grphic novel can be cast in celluliod. My favourite graphic novelist Alan Moore author of Watchmen, The League of Extraordinary Gentlemen and V for Vendetta has suffered terribly at the hands of Hollywood primarily because he won't have anything to do with the making of his films. He maintains that what he writes is specifically written in such a way as to make it impossible to work on film. That being the case he should really refrain from selling the film rights. Which is what I would do because The League of etc and V were exceedly bad films. But syaing that if Alan had actually helped out they'd have been watchable and probably moore (he he) people would be reading his novels.
"Assualt on Precinct 13" 
and "Vampires" 
"Species" mmmmm I can honestly say I wouldn't mind being alien "Hensridge" fodder