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 RamisThe child says, "Well geesh, the institutions that I'm supposed to respect - the church and the government - they're telling me things that don't appear to be true. Either I'm crazy or they're crazy." That creates the Absurd Child. The Absurd Child is one who says, "Well, I think they're crazy." So you live in this state of alienation from your culture and your society and your family because you see this rampant bullshit around you.
Harold RamisFind the most talented person in the room and if it's not you, go stand next to him. Hang out with him. try to be helpful.
Harold Ramis