What was the name of the movie that everyone was killing eachother and going crazy

There was a scene where there was a little girl playing in the driveway with a spider and she kills it and starts laughing crazy and there was another scene where two people are stuck in a hospital room and they have to get out without dieing because everyone trying to kill everyone and there doing it like very angrily ....Please if you know it let me know I really miss this movie