These scenes left viewers shocked, disturbed, terrified, or all three! Welcome to WatchMojo, and today we’re looking at the most bone-chilling scenes of horror in FX’s haunting anthology. Our countdown of the scariest "American Horror Story" moments includes Nuclear Armageddon, Adeline’s Death, Penny’s Transformation into the Lizard Girl, Dr. Oliver Thredson’s Secret, and more! Which “American Horror Story” moments have given you the biggest fright? Scream it out in the comments.

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