"But you've already studies this material" I argued. "Yes", he replied, "but I haven't really used it, and I really enjoyed the class last year." And in the long run, who am I to say that repeating the class isn't a legitimate way to spend the late afternoon and early evening. After all, it beats watching television. On the other hand, I try not to define the internet as a spectator sport, and I'd prefer that my students actually try and use the skills they're supposed to be acquiring in class. My jokes are often quite funny, but only the first time around.