+16
Yeah, The Ring was my #1, and the logic is really simple: no film has ever scared me more. I decided to prioritize that over any concerns about craft, influence, originality, whatever.
The Ring actually made me, in the theater, instinctively pull my legs up on to my chair. It made it hard to sleep the next few nights, it made me scared of TVs I could hear from other rooms, and it made me particularly scared for a brief period a week after I'd seen it. It made me scared enough that I'd get scared just scrolling through threads or by GIFs or images from it.
I'm at the point where I can see that image in the post above and not be freaked out (thanks to Scary Movie 3 for taking the air out of the scare a little), but for a year or two after seeing it I actively avoided any images from the film because they'd make me cringe and look over my shoulder and just be generally unsettled for awhile after seeing them.
The whole film is unsettling. The film within a film is unsettling. The hair, the walking toward the camera. But really, none of it holds a candle to the moment she crawls out of that screen. That is one of the first things I think of, when I think of the word horror.
The Ring is the scariest movie I've ever seen.