I’ll probably never be a guest on the Daily Show, but Ethan Watters’ advice for guests was interesting anyway. I’ve seen this advice from several former guests:

Don’t try to be funny unless you ARE funny. If you are not sure if you are funny, assume that you are not and if you try to be in this situation you will look like an incredible jackass because you are sitting next to someone who is preternaturally, almost freakishly, hilarious.