To me, this movie is very funny. I imagine this film will be very offensive to some people, since it gives a wrong/exaggerated idea of the mental illness it portraits, and some will probably also find the fact that it makes fun of said illness offensive. But at the end of the day, I found it funny. I like Jim Carrey and this is exactly his brand of humor. Read up on the movie though, if this kinda stuff offends you.