No, this does not mean that if you accidentally drop a line you're allowed to pick it up and eat it within three seconds. :) Remember that post I made about audio examples of the "correct" way to do iambic pronunciation? Ron Rosenbaum, he of Shakespeare Wars (which I'm not finished with), has a lengthy article up on the habit of making the slightest pause between each line, and why that might be. Someone writes in to him with an interesting suggestion about how human memory is organized and experienced, and how it fits in quite nicely. A neat read.