Ending *might be seen as spoiler*
Hehe, ok, I have yet to see, uhm, the Grudge I think, think I have seen the Grudge 2, so this might still be explained somewhere, but oh well. At the end of this film, there are two girls talking. Hehe, for some reason I got it into my head that they were two ghosts, sitting and discussing wether the lady that came to the house would go in or not so they could kill her =^.^= Oh, and then we hear the "Ju-On sound", which I took as one of the girls showing of her skills at being creepy to the other girl, and then of course the other girl shows of with some meowing sounds.
Of course, this take on the ending totally ruined the horror factor of the movie for me and I instead started to think of it as a sit-com =^.^=
On the other hand, this one was not nearly as scary as the others I have seen so far (all but the Grudge 1, including the american the Grudge).