Letterman's mom turns 88 and does the Top Ten List

If I were to pick my top ten favorite things in the history of late night television, the appearances by David Letterman's mom Dorothy would be on that list. She seems like a nice lady, and they always manage to find something funny for her to do on the show. Last week she turned 88, and via satellite from Indiana she gave the "Top Ten Ways Dave's Mom Is Celebrating Her Birthday."