Can I avoid that horrid "loading" ring of white dots on YouTube?

Help! I’m trying to show my class a couple of YouTube videos tomorrow, but I can’t get rid of the ring of white dots that gets superimposed over the center of the video, I suspect to signify that it’s loading. Even after the video has loaded completely—even if I watch it all the way through once and then slide the cursor back to the start—it STILL ruins the video with an annoying little ring of white dots going round and round in the middle of the screen. How do I avoid that?!?!