If anyone has their browser set to reload the pages that were previously open, be careful not to have one of those pages as the YouTube America's Cup site, with a video selected (even if the video is paused). Whilst you are looking at other tabs the chances are that the YouTube tab will be running away with your broadband allowance, if you have a finite package. I'd stopped watching the AC coverage to save using up my allowance but it seems that when the page reloads it starts the video running. Error

Lesson: CLOSE THE TAB!