The rule of thumb for a director or producer - which prevents them from just sticking their names on everything - is that you have to contribute substantially more than 50 percent of the character dialogue and story.
Harold RamisEveryone has experienced laughing at a funeral, and not even inappropriately. It could be a response to a moment of absurdity or some fond memory. We're human beings so we understand that laughter and crying aren't always disparate emotions.
Harold RamisI look for the meaning in what's funny, and I look for what's funny about things that are meaningful to me.
Harold Ramis