This is kinda off topic but...

Does anyone know the name of these three movies?
1.The first movie has a boy and a girl in a school or sawmill and all of the sudden the girl snaps and starts trying to push the boys head down onto a sawblade while screaming"do you love me?!"
2.The second one has a husband and wife in this huge house being stalked by a serial killer and in one part I think he takes out a syringe and injects something into the husband???
3.This guy keeps a deformed talking baby in a huge jar and everytime it kills someone it absorbs the person's mind,towards the end of the movie the guy breaks the jar the baby is just about to die but looks up at the guy and thinks"of course"then it uses it mind to merge them into one person.
If anyone one could help me out with this I would be VERY grateful because I have been trying to figuare out these titles for years