How to Caption a Funny Video
A caption on a funny video has one real job: not stepping on the joke the video is already telling visually.
Don't explain the joke
If the video itself is funny, a caption that describes what's happening usually weakens it — a short reaction, a tangent, or nothing at all often works better than narration.
React, don't summarize
Captions like 'not me discovering this' or a single exclamation land better than a literal description, since they add a layer of commentary instead of repeating the video.
Keep it short
A quick caption gets read before the video even finishes playing; a long one competes with the video itself for attention and often goes unread on a fast scroll.
Should captions include hashtags?
A few relevant ones can help discovery, but stacking many unrelated hashtags in the caption itself tends to look cluttered — most platforms have a separate, less prominent spot for a longer hashtag list.