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Tear Jerker: Dawn of the Dead
The deaths of Roger and Stephen.
During the iconic "No more room in hell." line, the survivors debate why the ghouls are so desperate to get in the mall. Peter rationalizes that it's not their flesh they are after, but mainly because they remember this place from when they were alive. It's sad to know that something as trivial as going to a shopping mall, could consume a poor soul during their state of living death.