If you actually go to Youtube to watch the videos, some of them have a "Watch in High Quality" option on them that isn't available when they are embedded here in messages. It helps them to be a little bit clearer if you have a fast enough connection (and these clips could use all the help they can get clarity-wise). It's not available on all of them, just some. I don't know why; Youtube does it automatically.
My Youtube user name is wen6pak.