Yea the latest advertisements for it say "the last 15 minutes of the movie will mess you up for life."
I watched the second one at night in my living room, with my room mate's $8,000 surround sound turned waaay up. Yea, it even made my dog jump and bark several times. There were a few times that I thought the windows were going to blow out from the sudden loud bangs!
Haha I was watching the first movie at my house and at the end when the guy or whoever comes flying up the stairs into the camera and then she pops her demon head into the picture my dog, who was laying behind me, FREAKED OUT barking and growling. It scared the piss out of me.