"Josh [Gad] is such an amazing improviser and is so good when the material is flowing from him that sometimes, if a written scene isn't working quite right, I'll tell him that we've got it and that he can just play. He'll blow us away with some super weird stuff and some wild things that we might use bits and pieces of in the edit, and then I'll say, "Just for good measure, let's do one more of the scripted version.""