Own the rights?
The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags are used sparingly in order to make the page more readable.
For detailed information about the amounts and types of (a) sex and nudity, (b) violence and gore, (c) profanity, (d) alcohol, drugs, and smoking, and (e) frightening and intense scenes in this movie, consult the IMDb Parents Guide for this movie. The Parents Guide for Yes Man can be found here.
Yes. The film is based on the 2005 biography Yes Man by British humorist Danny Wallace. Wallace describes the six month period during which he said "yes" to everything that was offered to him and how it affected his life.
Those who have both read the novel and seen the movie say that mostly everything was changed -- plot, setting, and names -- although the basic premise of a man saying "yes" to everything offered to him was kept the same.
Carl's ex-wife Stephanie wants to sleep with him again, but he says "No". Carl hides out in the car of Terrence, the person who started the "Yes" program. This leads to a car accident and Terrence telling Carl that he doesn't always have to say "Yes" if he doesn't want to. Carl then goes and meets Allison at her jogging class and he eventually convinces her that they should be together.
r73731