When a link is posted to a video that you have seen before on these forums, please do not go on and on about this fact.
We get new people to these forums every week, and it's good for people to see a video/funny link that was mentioned a few months back. Let the newcomers enjoy it. Some people who have been on the forums for years may not have seen the video either.
May I also point out, that the search tool is very useful. Search the forums quickly before you re-post a video, just in case it's been posted recently. If someone has, however, posted something that was recently added, don't throw spam and abuse at them for doing so. It may have been a different link/different site. Just say to them nicely that it is a recent one, and point them in the direction of the thread.
Also, please name your topics with useful names, such as the subject of which the video/funny is linked to.
Please be sensible about this, and just enjoy the videos.