Returns is a good Batman film. '89 really isn't. (but isn't bad by any means) Forever has aspects of a great Batman film, but throws in campiness and the neon. Begins is a new interpretation.
Phantasm is the Batman film. Period.
I find that it is fun simply to whisper "Michael Keaton" at random moments and make a quizzical face. This is a habit I picked up while playing Arkham Asylum.