If you've ever seen these then... you know all those moments where you randomly see Sadako? Like reflected in mirrors or briefly behind the characters? Those terrified me because I never noticed them until I had watched the movie multiple times...
And in Ring 0 birthday, in addition to those moments, the ending scene:
ring (original and 'birthday')
And in Ring 0 birthday, in addition to those moments, the ending scene:
https://www.youtube.com/watch?v=k_ZeILDNk6A
crunch crunch.