Good horror type movies?

so im having a b-day party next friday and its all girls. so we're gonna watch a lot of movies then go in my hot tub then sleepover. so we're gonna watch some chick flicks and horror movies. but here's the thing, my mom's like very christian so it can't be too explicit or graphic, or gory. nothing rated r, if its pg 13 it can't be too bad. and i can probably fine some romance movies, but if you have some really good suggestions for some then feel free to add these. but i definitly need some good horror movies. i want them to be very scary but stilll be mom appropriate. kuz after really scary we'll just follow up with a romance. so any ideas?