In 1995, Bill Clinton decided not to give a funny speech at the White House Correspondents Dinner because we were still just ten days removed from Timothy McVeigh blowing up the Murrah Federal Building in Oklahoma City, killing 19 children and 149 adults. The wound to the American psyche was still too raw, so the president made some somber remarks that night.
The day before, however, there was still a chance Clinton go for the jokes, so Mark Katz, his speechwriter, had worked up a humorous monologue for the president. When it became apparent that doing the routine at the dinner would not be appropriate, Clinton still wanted to read the speech out loud, even if the only people to hear it would be Katz and a couple of other staffers.
Here is Katz' reminiscence of that day.