Youtube video encoding quality

This is interesting: some guy uploaded a video of himself to youtube, then downloaded the same video from where he uploaded it, then uploaded that newly downloaded video again, and repeated the process. It's cool to see how the audio/video really deteriorates. Here's the video at 25 times, 100, 250, 500 and 1000. By 1000 (the last one) , it's completely unintelligible.