In Alice Munro's "Too Much Happiness," the protagonist experiences intense physical reactions to certain ideas or suggestions. These responses include a noticeable tension in her facial muscles, a sharp transformation in her gaze, and an involuntary movement of her mouth, all reflecting her disgust or disapproval. The imagery evokes a sense of danger, highlighting how these thoughts are so powerful that they can immediately halt anyone in their tracks, similar to the effect of a harsh, prickly thornbush.

This portrayal illustrates the depth of the character's emotional state and the seriousness with which she reacts to certain stimuli. The vivid descriptions serve to emphasize her discomfort and internal struggle, showcasing how it can manifest physically. Munro effectively captures the complexity of human emotions, demonstrating that even subtle ideas can trigger profound reactions, ultimately affecting interactions and relationships.