chumbucket This film changed forever how I watch movies (to expect the unexpected) and likely changed how a lot of movies got written. Unfortunately it seems like it's been done to death. (didn't intend that, really URR GAWD SPOILERRRRR!!)
Binro the Heretic It's the first time I recall seeing that freakish sped-up shaking and convulsing thing done in a movie. It was upsetting and horrifying.
Now, unfortunately, nearly every cheap shoddy horror flick since has ripped it off, rendering it cheesy and hackneyed.
Old_Zircon An Occurrence at Owl Creek Bridge did it in 1890, though.
deadpan First time I saw this I was waiting for something horrible to happen in this scene. There's an undercurrent of dread throughout this film that is rarely achieved today.