Bush had a dinner night. Usually his guests do live entertainment such as comedy.
Stephen Colbert did that, except he didn't dull the sharpness of his wit, dumb down his material, nor edit it to please all of the room's guests and media.
A lot of you know of
this article on what happened at the event, but:
Did you see it?
Behold!
Colbert Roasts Bush!
Part I (8:54) Part II (9:40) Part III (7:10)