The only seen I can remember is that there is a group of kids in there mid 20's and they are hiking out in the forest or something. There is a particular seen where its night and a few people from the group go rock climbing on a cliff near a river and it turns out one of the girls pushed another off the cliff and killed him/her then she/he goes on to kill the rest of the group one by one.
If you can think of this movie, please let me know the title.
