New widgets are making it easy for users to hack videos (including those on YouTube) to add graffiti and sarcastic commentary. For example, Vidavee Graffiti enables you to load a video directly from YouTube and then mess with it.
Implications - Leave it up to streaming videos to be on the cutting edge of cool. While hacking was once considered a geeky task that hadn't gained much public attention, wicked YouTube videos like these will help have hackers everywhere getting all sorts of new credit and appreciation!
Some of the features are rather corny, but it is very easy to use. Either way, keep your eye on this space and expect more innovation.