If she had just stopped there, the town would have probably been ready to call it even.
Then Carrie stumbles back home and kills the real villain of the movie -- her mother, a cruelly evil Bible-thumping taskmistress who was Carrie's chief tormenter -- before using her mind-flexes to implode their house.
Carrie's mother is so over-the-top evil that she's like a kindergartner's drawing of violent religious insanity. In fact, the character was so broad that Piper Laurie, the actress who plays her, was convinced the movie was a comedy when she first read the script. The mother was so operatic to her that she thought the character was intentionally cartoonish.
She was surprisingly lax about wire hangers.
Director Brian De Palma had to take her aside and explain that he wasn't exactly going for laughs with his film about abuse, rage, and supernatural murder. Still, Laurie couldn't shake the idea that her character was completely ridiculous, and she laughed constantly between takes. This might have something to do with the scene in which she refers to her daughter's breasts as "dirty pillows," completely stone-faced and without a trace of irony, or it could be related to the Phantom of the Opera cape she wears in every scene with a similar lack of elbow-nudging winks.