I have a lot of respect for people who are great at ad-libbing and for writers and directors who are able to create a scene in which that works. Judd Apatow is fantastic at it. But as an audience member, I like the sound of something that's been written - I like it to sound written.

Oprah was famous for going to a garden party and ad-libbing. She could literally interview people for a half hour about nothing, and it was entertaining. She had her own show before she had her own show.