Clap — awkwardly — at something that no one else clapped at? I don’t know. The “most spontaneous” phrase reads a lot like “most dead,” “most unique,” or even “most perfect” to me.
If the question aims for something at the intersection of major life events and spontaneity, it’s more likely to yield romantic revisionism than truth. Being truly spontaneous at scale is a hard way to live if you’re not a hermit or a crazy sage.
