I posed this question on The Eloquent Woman on Facebook, and it took almost no time for a gang of readers to agree that the advice to picture the audience naked was their pick for worst speaking advice ever.  (Even so, I Can See You Nakedis one of the best-selling presentation books ever.)

But there were a couple of other nominees: Bobbi Newman voted for the advice "that feedback forms are important and useful" and Claire Duffy offered, "From my 5th grade teacher: 'To quell nerves let...