Hmmm... tempting...
Though what would I talk about? I really have nothing to say beyond bitching and moaning about where I live.
You basically find an already popular Youtube channel (preferably a gaming channel, due to the nature of the fans). Whenever they release a new video, record around 40 seconds of yourself saying something inane like "hi guys, so I just finished watching [video], and I liked this part, didn't like that part, and this other part was good so check it out, ok bye", name the video "RE: [title of video you're replying to]" and upload it as quickly as you can. If you do it quickly enough, you'll get a nice big chunk of extremely easy ad money.