Shutter/YMMV

Funny Moments: When Tun is in the bathroom and asks for some toilet paper from the stall next to him, a woman's hand hands him some. Thinking that it might be Natre, he leaves his stall and slowly moves to the adjacent stall, kicking it open to reveal... a male-to-female transexual. Who is in the middle of taking a dump. Possibly doubles as a Non Sequitur Scene, as the tone of this scene is considerably different to the rest of the film.
High Octane Nightmare Fuel
Moral Event Horizon - It is eventually revealed that, while she was alive, Natre was raped by one of Tun's friends, while his other two friends held her down. Tun then walked in on them, and, instead of rushing to his girlfriend's aid (he was still, presumably, keeping their relationship a secret from his friends), he not only decided to keep the rape a secret, thus protecting his friends, he also took pictures of the restrained and traumatised Natre, so that his friends would be able to use the images as a form of blackmail. Afterwards, when Natre becomes suicidal, he dumps her. Although he clearly regrets the whole incident, some viewers lose all sympathy with Tun at that point. Years later, when Jane finds out the truth, his only defence is that he was "young and stupid". No wonder Natre's pissed.
- This twist is similar in the American Remake, except it is pretty much clear that Ben planned everything all along, being the one to dope Megumi, and was pretty much there all along during the entire rape. Even after he gotten the pictures he came for, he didn't interfere when his friends proceeded from molestation to rape.
Narm - The US remake has the Tun-equivalent get attacked by Natre-equivalent's long, grotesque, thick tongue at one point. It really doesn't fit in with the rest of the movie at all and is frankly just ridiculous.
Toilet Humor: The aforementioned scene with the transexual in the public toilet.
The Woobie: Natre, after the viewer learns about her past.