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 RamisWhatever bliss we think we're going to find, we may find it in brief flashes, fleeting moments that come and go. There's an impossibility to nailing down any good feeling.
Harold RamisI feel a big obligation to the audience, almost in a moral sense, to say something useful. If I'm going to spend a year of my life on these things, I want something that I feel that strongly about.
Harold Ramis