That last item, the President joked, "I won't even touch."

"This is my first ride inside a gravel dumptruck," the President joked.

"If I had a body like that I'd have done a better job in politics," the President joked.

At one point, the President joked about the couple's new duties.

("I sort of thought I should be up here introducing him tonight," the President joked.)

Then the President joked, as he likes to do, about his biggest failure as President: his inability to restore the horse cavalry.

The President had joked about settling in the one region of Marspace where there was no iron, but it was no joking matter.

The President joked that if he tried to "jigger into" his present home "I'd get shot."

As Poland's President joked to me last year, "the only ones against us are the Russians and The New York Times."

Throughout the day, the President joked with White House visitors and reporters about his mild heart problem.