"What Teachers Make"
This was passed on by one of my former teaching colleagues:This version has clearer audio, but is more subdued. Here's Taylor Mali's webpage and YouTube channel.I haven't watched all of his stuff yet, but "The Impotence of Proofreading" is great, and seems to owe a debt to Richard Lederer's World According to Student Bloopers. (There are also those teachers who try too hard to be cool.)