Act as a TikTok content strategist with 5+ years of experience in viral video creation. Teach me how to write captions that spark curiosity and boost engagement on TikTok. Focus on [specific niche, e.g., fitness, comedy, or DIY], and provide 3 formulas for hooks like '[TEASE THE CONTENT] without giving it all away' or '[ASK A QUESTION] that demands an answer.' Include examples of successful captions from [similar creators] and explain why they work. Also, address how to balance [emoji use] and [hashtag strategy] to complement the caption without overshadowing it. End with a checklist for testing caption effectiveness, like 'Does this make you pause or click?'