When you come across something that leaves you contemplating long after, it is called a thought-provoking moment. Here are some synonyms that can convey similar meaning- a mind-bending moment, an eye-opening experience, a reality check, an epiphany, a profound revelation, an introspective insight, an a-ha moment, a paradigm shift, a mental breakthrough, a life-altering realization. These phrases capture the essence of thought-provoking moments in a unique way, ranging from sudden realizations to gradual growth. In any case, the experience of engaging one's mind and challenging one's perspective is always valuable, and these synonyms capture that essence perfectly.