Most replayed

Start seeking on a watch page and a curve appears above the progress bar. The higher the line, the more often that moment has been replayed. Creators read the peaks as the parts that worked: the demonstration people scrubbed back to, the joke worth a second look. It does not appear everywhere. A video that is very new, has too few views, sits on a channel with an active strike, or gets flagged as potentially inappropriate will show no graph at all. The genuinely useful part is that it is public, so you can open somebody else's video and see which moments their audience returned to.