Act as a TikTok content strategist with 3+ years of experience in viral video creation. Teach me how to effectively use TikTok stitches to create engaging reaction content. Cover the following: [1] Step-by-step instructions for stitching a video, [2] Best practices for adding your reaction (e.g., timing, framing, and tone), and [3] Strategies to make your reaction stand out (e.g., humor, insight, or creativity). Also, include tips on [how to choose the right videos to stitch] for maximum engagement, [common mistakes to avoid] when creating reaction stitches, and [how to encourage viewers] to engage with your stitched content. Provide examples of successful reaction stitches and explain why they worked.