There is almost too many memorable scenes in this movie. Actually, the whole movie is one big brain-feeding eye feast.
But if I had to pick one scene that stands out, it’s the scene where David is taking HAL’s main core out. There is no sound except the David’s heavy breathing in the helmet, and HAL’s constant “Stop, Dave. Dave. Stop, please.” This is one of the best death scenes in the history of filmmaking, in my opinion.