The first and last scenes

Rating: 7/10 (2 July 2009)

Anyone notice at the beginning of the movie, the event started happening with the TWO women sitting together? Then, when the event started again at the end of the movie, it was TWO men walking together? Both times, one of the people were talking and started acting weird. I found it weird how the event seemed to start with a couple of the same sex. Was there a significance or is this just a coincidence?
Anyways, I thought it was an interesting movie. I have only seen a few other movies by M. Night and one can certainly tell this is one of his. It's twisted and thought provoking. There was no cameo appearance though, was there? That's kind of M. Night's signature to his movies. So that is surprising.