YouTube - If you navigate away from a video, then immediately return, the player continues where it was left off.
YouTube - Clicking on the “Report” icon on YouTube stops the video if it’s currently playing.
YouTube - To celebrate 1 billion views, a tiny dancing Psy was added to the video page for Gangnam Style.
Youtube - The settings icon spins when you change quality of the video until it stabilizes.
YouTube - When viewing a music video, it tells you where and when that artist is playing next in your area.
YouTube - An old-school TV static animation is shown whenever a video is unavailable.
Youtube- When watching a video exceeding one hour, scrolling over the timeline will give you a magnification of the 2 minute timeframe.
YouTube - When typing in the search box, the autocomplete dropdown size will be limited so it doesn’t cover the video.
Google+ - When inserting a URL from Youtube into a comment the URL is automatically transformed into a legible structure.
YouTube - The play icon changes to a replay icon at the end of the video.