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Reaction videos

A reaction video is a short where a host watches a piece of content and reacts to it — sometimes pausing to explain, joke, or call out a moment.

Popcorn does these end-to-end: you give it a URL and a host description (or an existing character), and it produces the reaction with commentary, picture-in-picture framing, and captions.

When to use this

Section titled “When to use this”
  • A clip is going viral and you want to weigh in fast.
  • You’re building a channel of reactions to a specific creator, sport, news, or genre.
  • You want commentary over a tutorial or explainer.

Prompt pattern

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Reaction video to <URL>. <Host description or @character>. Focus on <the moment / the angle>. <Tone>.

Examples

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Reaction video to https://www.youtube.com/watch?v=XXX. Host is @Milo — sceptical, dry. Focus on the moment at 0:42 where the speaker contradicts themselves. Vertical, 30 seconds.

Make a reaction video to this TikTok: . The host is a hyped Gen-Z influencer in a bedroom set. Add captions on every line. Vertical, 15 sec.

What Popp will do

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  1. Download the source clip from the URL (Popcorn supports YouTube, TikTok, Instagram, X, and 1700+ other sites).
  2. Use AI to identify the most reaction-worthy moment(s).
  3. Generate or use the host you specified — talking head, picture-in-picture, or full-frame.
  4. Write reaction commentary based on what’s actually happening in the clip.
  5. Compose the final video with captions and any music.

Tips

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  • Pick or create a recurring host. Use a character element so every reaction video has the same face and voice. This is what makes a reaction channel feel like a brand.
  • Be specific about the moment. “React to the moment at 0:42” will produce a much tighter video than “react to this clip”.
  • Vertical works best. Reaction videos thrive on Shorts, Reels, and TikTok.

A note on rights

Section titled “A note on rights”

Popcorn will fetch and use the source clip you provide. You are responsible for ensuring you have the right to use that material — fair use for commentary may apply, but it varies by jurisdiction. We don’t make that call for you.