The infamous drill scene from City of the Living Dead:

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Death by clogged sink drain from The Blob ('88):

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The defibrillator scene from The Thing:

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while it lasts
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the tent scene in Jason Goes to Hell (contains nudity, and of course lots of blood and gore) 3:00 forward

Can't forget this one. Awesome and incredibly well-made:
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I was going to post the one that TallGuyMe added (nice one, btw), so I guess I'll go with this classic...

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Let the Right One In

The entire end sequence of Day of the Dead is Romero's finest work of gore. Some amazing AMAZING practical effects there.

I've always loved Dario Argento's Opera as far as scary death scenes go... because it's not only that the person is getting killed, but there's another victim who is forced to watch (or have her eyeballs poked out with pins).

Oh, and for the people who love camp... here's a clip from my favorite campy horror film: Sleepaway Camp 2. The Sleepaway Camp films have some of the most fun deaths combined with some of the most atrocious acting ever.

And probably the most scary film I've ever seen contains a ton of great scenes. Probably more scary because I saw it when I was like, 12.

31 posts and no one has mentioned this?

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Or this...?

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(Thanks to the horror challenge) My new recent favorite:
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I couldn't find a youtube video... but the peephole death in Argento's Opera is definitely one of my all time favorites.

how could you forget the gut upchucking scene.

others:

death by stereo - 'Lost Boys'
death by falling piano - 'Zombieland'
death by microwave - 'Gremlins'
death by lawnmower - 'Dead Alive'
death by nail gun - 'Final Destination 3'
broken glass bottle stabbing - 'New York Ripper'
shotgun blast to the head - 'Maniac'
pitchfork in the stomach - 'The Prowler'
axe in the head - 'Pieces'
decompression room sphincter explosion - 'Men Behind the Sun'
body ripped apart on tree - 'Demonia'

Let's not forget this one:

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And of course:

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