If you're doing six takes, instead of doing six variations on the same words, why not just throw out the words and make them up as you go along, if you're comfortable with it? It gives the movies a slightly rangier feeling, and more of an accidental feel, but it also makes them edgier.
Harold RamisThe 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 Ramis