Guidelines for giving a truly terrible talk
"Strict adherence to the following time-tested guidelines will ensure that both you and your work remain obscure and will guarantee an audience of minimum size at your next talk."Independently, David Sholl has illustrated the problems in concrete ways with an actual talk "The Secrets of Memorably Bad Presentations"
I am not sure if it is funny or just plain painful. But it does drive home the points.
All students (and some faculty) should be forced to watch it in full.