Joe Biden and Sarah Palin are polar opposites, but as we slouch toward the Vice-presidential debate, we know they have one thing in common: when they open their mouths, it's likely to be entertaining, and in some cases, cringe-inducing.

This may be the most-watched Vice-presidential debate in history, not because of what we as a nation wish to learn about our on-deck leaders, but because of a NASCAR-like hope that there will be a spectacular crack-up at some point during the race. Even if Palin obeys her trainers and says nothing absurd, Biden may oblige and step over his own tongue for us.

Let's break out the popcorn and enjoy our American Civics, demolition-derby style.