1. Click the link below
http://www.membershipchangeseverything.com/index.jsp
2. Click on "Movie" at the top
3. Enter you info and your AMEX card number (they just need it for verify purpose)

Supposed to be just for NYC area theaters, but the code they give you can be used for any Fandango theater tickets.

If you ARE in NYC there's a related free dinner offer you can get. Not much use if you're not local since they won't ship the food out for you