The title really explains itself, as Letterman says.
Regarding clips of Cheney, my personal favorite is this amazingly prescient clip of 1994, in which Cheney explains why invading Iraq and toppling Saddam would be disastrous. If only he'd listened to himself.
For more fun with Dave and Dick, don't forget Letterman's contention that Cheney "just couldn't care less about Americans" and has sold them out to the oil companies in return for "some great annuity when they're out of office."
Ah, what will we do when we don't have grim-jawed Dick to kick us around anymore?