I've noticed recently (last few weeks) that when I click on a youtube video from a Google search I get taken to a redirect page (happens instantly) before I actually land on the video on youtube.com. It means when you click the back button, you hit the redirect page and just get sent back to youtube.
Obviously you can open the history and go two pages back to the search results but but I dont understand the purpose of Google doing this.
(I can imagine it would annoy the hell out of people who dont understand whats happening...)