JU-ON THE CURSE 1: Stairs scene, that was freakier than Ju-On The Grudge or The Grudge. Followed by the "Garbage bag" scene. God, I was backing away from the screen!
JU-ON THE CURSE 2: The scene where the wife is all like "What are you looking at?" And then it shows Kayako with her eyes shifting.
JU-ON THE GRUDGE: Nothing, it was actually funnier than it was scary.
JU-ON THE GRUDGE 2: When she opened the door to find Toshio leaning over the mother.
"Trapped in a web, but I cut the threads, show you the gates of tomorrow." - Iron Maiden

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That is what we like to call a "Ju-onverse"

There are so many scenes that are disturbing and creepy in all four movies. A couple of the most effective (for me) are:
Ju-on 1 (tv): Of course, the girl going up the stairs and turning to her mother with the bottom half of her face gone.
Ju-on 2 (tv): The whole Kyoko segment when she is rocking back and forth with the doll, and the scenes where her parents die (the mother with her head in the room and laughing hysterically before keeling over), and when they go back to the house at night with everyone dead and Kyoko/Kayako still rocking in the room.
Ju-on : The final crawling down the stairs scene is almost impossible to watch because it's so creepy (the expression on Kayako's face!).
Ju-on 2: When Keisuke (sp?) the tv show director/producer follows Megumi into Kyoko's house, and she comes out from behind the screen with Kayako's journal.
One thing that hasn't been mentioned yet and that is part of a few of these movies is any time a character is in the house and it goes from daylight to sudden darkness. That is very effective. I can't imagine that happening to me and not dying of a heart attack on the spot.

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See, for me not sure what I'd put as the 'Scariest Scene'.. but in the end of the Grudge 2, when Kayako is crawling out of Kyoko during the birth then at the end when reborn kid Kayako pushes Kyoko down the stairs.
That little girl nailed the role of the mother in the look and walk perfectly in my opinion. It was really incredible.

I now add the whole gruesome murderscene from the American Remake Directors Cut to my list.

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To be honest this movie really didn't scare me. I'm very easily frightened and freaked out but this movie was just average in that dept. Sure I was tense most of teh time but I didn't scream or jerk once. Now a Tale of Two Sisters . . . that is one helaciously scary movie shudder
edit- silly me . . . I just now realized I watched Ju-on The grudge. Why are all the titles and information here so confusing >.<

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I can try and make a list

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Kayako's awfully sneaky, isn't she

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I'm a very jaded horror movie freak, having seen everything there was to see for around twenty years, but I'm not ashamed to admit "The grudge" (US version, the Japanese one are not available in any form here grrrr !) scared me like no other did in a very long time. Of course, it was not always logic and there were holes, but nonetheless, it worked like hell ! From what I read here, it seems to be a compilation of scenes from the original movies, right ? Seems they are even scarier !
In the remake, I like the fact that the ghost was really a primal, unstoppable force that could get you No Matter what (Okay, what did it do with its victims ?), and the fact that the Western characters seemed perfectly adapted to Japanese culture and even spoke the language. No "Lost in translation" here !

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Jaw scene, jaw scene, jaw scene. It wasn't just when she turned around for the reveal, but the way she was walking up the stairs like a badly manipulated string puppetonly manipulated by death.
Wow! Best body acting in a movie since Rie Inou's chilling performance in the finale of Ringu.
Cyn

My favorite scene in the original V-Cinema version has to be after Toshio meows and we cut outside. Right before we cut to black you can see Kayako in the upper story window. Plus the jaw scene.
In the 2nd tv version it has to be the pictures on the wall changing from normal people to just Kayako.
In the first theatrical versionit has to be during Izumi's chapter when she's crawling away from her friends and Kayako emerges from the shrine.
The Grudge 2: The whole movie. But to be specific, it has to be the entire Nori Chapter. thumpthumpthump

ack! all good ones! tho i have yet to see Ju-On: The Grudge 2 yet
but in that second oneone scene that really got me was when the old detective was looking at the ceiling and his wife came in and looked up to see what he was looking at.and Kayako was up there and her eyes were shifting!!!
OMG!! i'm getting chills just writing about it!!
and i'll never hear a cat howl quite the same again shudder

And the most personal annoying part is from the 1st tv movie the whole scene where the girl is waiting for the teacherto come back, who was gonna find her boyfriend. ANSWER THAT DAMN PHONE!!!! man I hate the phone when it keeps on ringing it gets on my nerve!!!
Yah, I HATE THAT!!!! It's soooo annoying!
Formally known as Denzel Lockheart.
Best movie ever: BATTLE ROYALE (2001)

Creepiest Scenes by far (havent seen either theatrical ones yet)
1st TV movie - When the girl (forget her name) is waiting in her friends room and she hears that clicking noise the wife/ghost always makes, and she goes to investigate the crawlspace, and you know what happens after that!! Damn that was really freaky!
2nd TV Movie - When the Detective burns the photo in the police station, because he doesn't want to have anything to do with the case anymore, and he walks into his office ONLY TO BE FOLLOWED by the Wife/Ghost!!!!!!
Also when the teacher is visiting the house and the lady that got possessed and killed her husband with the frying pan, puts her down while teh teacher looks through the kids drawings, only to have the lady crawl up to him with her head still down!
Actually there were a lot of really freaky scenes in this film that stuck with me for days and days after watching it!