1. Movie starts with a house that is littered with dead bodies. All killed in bizarre/unusual ways. House is full of cops investigating the scene. There are two plain clothes detectives walking around the house checking shit out. The two detectives walk out the front door into front yard and ask each other "What in the fuck happened here?"
Then the movie backs up and tells the story of what happened. I think the dead people were all bad guys. Maybe they were holding somebody hostage in the house or something. The killings take place real quick, one big violent scene. Every time somebody is killed and falls down you remember that body lying there from the beginning of movie.

2. Something to do with serial killer or people going missing. This guy, don't know if he's a cop or personally involved because a family member has gone missing. This guy has a hunch that leads him to this house. He knocks on door and old lady answers. He doesn't suspect her so he's caught off guard when she knocks him out. Turns out it's the right place and old lady is in on it, protecting her son or something. He's thrown into a pit and car is parked over the trap door so he can't get out. Other cops show up, not suspecting the old lady. The guy in the pit can hear them and he's yelling to warn them but they can't hear him.

#2 sounds like the ending to...

Don't know but that sounds like an awesome movie!

#2 is Prisoners. Thanks.