Not sure if this has any practical use, but it would be interesting to tie user comments to a specific time in the video so that you can see comments about spec

Not sure if this has any practical use, but it would be interesting to tie user comments to a specific time in the video so that you can see comments about specific parts of the video. For example, instead of watching a video, then scrolling down to read a user comment like "watch the blooper at 3:57", you could have a ticker below the video where "watch the booper" popped up at 3:57. I know the video author can add annotations, but users can't.