The phrase "makes sparks fly" usually conveys a sense of excitement or agitation. However, there are some antonyms that represent quite the opposite. Words like "calm," "soothe," "relax," "pacify," and "placate" all suggest a peaceful or tranquil state of mind. These antonyms are more likely to be used in situations where a calming effect is needed or when one wants to avoid any kind of conflict or tension. Similarly, words like "orderly," "structured," "well-planned," and "methodical" are also antonyms, implying a sense of organization and predictability rather than chaos and unpredictability that might come with making sparks fly.