Watching YouTube videos are always fun. Here are some random tips that will give you a better YouTube experience.
You could see the HQ button on the player that toggles the video quality between Normal and High quality.
Login to YouTube, which is pre-requisite for this tip, and go select Account->Playback Setup. You will get the following page.
Based on the your Internet speed you can default the video playback quality to either Normal or High. If you are not sure of your Internet speed, then you can leave this with YouTube to select the playback quality.
In the same page, you can also find the option to turn-of annotations permanently for all videos. I would personally suggest to turnoff annotations, because most of the annotations in YouTube videos are useless; also distract the video playback.
Select your preferences and click on Save Changes.