I saw Ringu before The Ring. 3/4 of the way through it, my phone rang. That was the closest I've come to actually peeing my pants in a very long time.
I highly recommend Ringu and Ju-on (Japanese version of The Grudge) over the American versions. They are much scarier... maybe because some things are lost in translation and I didn't understand it as well. I dunno, but they're friggin' spooky.
I still can't look at TV when it's off.