Have you experienced a class where things just didn’t work?  You tried and tried, but it just wasn’t going to happen.  The students didn’t seem engaged and for whatever reason, the class bombed.  Don’t worry…it happens to everyone!  Take a look at this article from Stanford University’s Speaking of Teaching: Why Good Teachers Have Bad Classes: And What You Can Do About It.  In addition to including some great tips, it also has a personal note, "Confessions of a Bore," that might make you feel better about your own situation.