SPOILERS ABOUND!!!

Rating: 10/10 (1 May 2002)

The quality of this film is obvious in the actual number of comments it has generated. It is doing just what Lynch wants: stimulating people to think and react.
STOP READING NOW IF YOU DO NOT WANT TO KNOW!
This film is Diane's story. Betty is Diane's fantasy self and Rita is Diane's fantasy Camilla. The entire first half is the fantasy. D knows she can never have C because C is not interested in her (even though C could have lesbian tendencies). If C is recreated as an amnesiac,R, and D is recreated as the perfect small town girl, B, than the slate can be wiped clean for the two of them to be together.
The second half explains the circumstance leading to the fantasy. Perhaps the actual fantasy takes place during the split second from the bullet entering D's brain to its exit and her death.
As usual Lynch has included a number of inexplicable intricasies that have some sort of subtextural relationship to eachother. Just that much more to discuss with friends.
I recommend everyone watch the film at least twice in an attempt to understand.