The BBC has a good collection in an article entitled The 'misunderestimated' president?

If you want to see the goofy side of the early Bush, look for a documentary called Journeys With George, by Alexandra Pelosi. It's her "home movie" of the 2000 U.S. presidential campaign.

In it, Dubya does an imitation of himself mangling his stump speech that really is quite funny.

Unforunately, his presidency was no laughing matter.