It depends on the girl and her mood. A joke is a good place to start and occasional cynicism is another way, but work to not to come across a jerk.
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A 15-year-old girl's sense of humor and what makes her laugh can vary greatly. Some common things that may make her laugh include jokes, funny stories, puns, silly facial expressions, or humorous situations. Sharing inside jokes or memories with friends or watching funny videos or shows can also evoke laughter.