This is from Batman (1989) where Bruce Wayne is talking to Vicki Vale and Alexander Knox in a room in the Wayne Mansion.
During the conversation, Bruce Wayne gets interrupted by a wine steward who says:
Mr. Wayne, we need more champagne. Is that all right?
Bruce says: Sure. Go ahead.
Bruce says: How many cases? Six? Six?
Alexander Knox says: Six is good.
Bruce says: Six. Thanks
Subtle reference to the beast by the script writers. Here is one of the first drafts of the Batman movie script and no subtle 666 reference: http://www.dailyscript.com/scripts/batman_production.html
It must have been a final edit. I'm not surprised.
Coincidence theorist will think it's just a coincidence. To me, it was done on purpose by the script writers as a final last minute edit considering it wasn't in the first draft as I referenced above.