Movie fragments that stick to you

I've been alive and cogent for a number of decades now(well, alive at least. The cogent part is up for debate )

In the span of those decades I have watched a number of movies. I liked lots of those, and I can usually recall a movieplot after I had seen it with sufficient memory jogging (sometimes up to seeing the opening again).

However, some scenes will never fade. Some have personal meaning, some just solicited some sort of unexpected jolt of emotion and thus stayed fresh.

Let me mention some.
I saw the movie Alien way before I was mentally ripe enough to place everything in context. Consequentially, I found the thing hugely scary, and up to this day, it may be my favorite horror movie of all time.
Of course, there's the famous stomach bursting scene, or the end 'fight' in the escape capsule, but the scenes that most stood out to me were:
1) the scene with the huge room and the chains hanging down out of the darkness above. They clink together, and there's constant dripping of water. It's when Brett(the mechanic) dies. I never understood why this 'room' had the chains and the water dripping down, and hence it has stuck with me through the years.
2) the dismembered head of Ash that is being interrogated. IT was just... milky white gruesomeness to my juvenile mind.

In Nightmare on Elm Street, I can to this day recall the children's rhyme. It's eerie, and entirely fitting. And the fact you can hear it at the start of day at the opening, and as well at the end of the movie? Bonus points...
One two, Freddie's coming for you,
Three four, better lock your door,
Five six, get your crucifix,
Seven eight, better stay up late,
Nine ten, never sleep again...

Top Gun:
The montage around the Kenny Loggins 'Danger zone' song. Specifically, Tom Cruise riding on his racer into the sunset/sunrise, and then looking at the fighter jets taking off. It all screamed cool and macho, and my adolescent mind absorbed it up like a frigging sponge.

Lethal Weapon: The scene where Mel Gibson swallows his gun and comes this close to pulling the trigger, all while watching a cartoon in his camper.
That scene was jarring for me, since I expected a rather light hearted action movie. It really helped to flesh out just how on the edge Riggs was though. I think it was the juxtaposition of the merry cartoon (something christmassy I recall) and the contemplated suicide that really hit home.


So, before I make this list too long to mention, do any of you guys have scenes that stuck with you, and do you have an explanation why?