Batman Returns/Fridge

Fridge Brilliance

 * The change of the Batsuit from the organic look of Batman to the armoured look of Batman Returns? Mere stylistic choice? Not so fast! In the first movie, Batman is feared as being a giant bat, a literal supernatural monster. It's only when crooks get a good look at him and realize it's body armour do they realize that he's human. What helps with the illusion? The sculpted muscles on the suit. They hide nothing the armour aspect completely in favour of getting that extra fear value. But at the end of the movie, Batman is publicly declared a hero, and the illusion is lost. So what does he do? He scraps the "giant bat" look and dons a more mechanical and armoured looking suit, and it can be assumed with the larger plates that it offers a lot more protection.
 * This one is fairly obvious, but still deserves a mention..

Fridge Horror

 * When researching the Red Triangle Gang, Bruce discovers that their Freak Show formerly featured an "aquatic bird boy", around the same time that the circus was shut down after numerous reports of missing children whenever they visited a new town, implying that the Penguin has been murdering children his entire life.

Fridge Logic

 * So no one has ever noticed that by setting off the Bat-Signal, a second one is activated that shines right into Wayne Manor?