Sharing these as some here might find them interesting. Rather than just display an error message on a black screen, Blu Ray discs from Eureka have individual screens and messages when there is a region mismatch between disc and player. Some are really simple and just have the error message overlaid on the image used for the main menu. Others feature a still from the film with some in particular having specific shots clearly chosen to reflect the fact it’s a bit crappy that you are even seeing the screen and possibly unable to play the disc. They’re very clear that the region-locking isn’t their choice with some of the text being very direct and to the point about what the author thinks of region-locking. Gate of Hell, Silent Running and especially Island of Lost Souls don’t pull punches in condemning these restrictions. It’s such a small thing but it’s kinda neat that someone went out of their way with these, especially on multi-disc sets with different images on the different discs.
Curiously enough, their Drunken Master release is actually region-free so it doesn’t have one.
College:
The General:
Buster Keaton: The Complete Short Films: 
Go West:
Our Hospitality:
Battling Butler:
Steamboat Bill Jr:
Sherlock Jr:
Bela Lugosi/Edgar Allen Poe set disc 1:
Bela Lugosi/Edgar Allan Poe set disc 2: 
Karloff at Columbia disc 1
Karloff at Columbia disc 2:
Silent Running: 
Shane: 
Island of Lost Souls (They really went in with this one):
Gate of Hell:
Police Story:
Police Story 2:
Project A: Part 2:
Wheels on Meals: 
City Hunter:
Dragon Inn:
Legend of the Mountain:
Raining in the Mountain:
A Touch of Zen:
Once Upon a Time in China:
Eastern Condors:
The Odd Couple:
Iron Monkey: 
Encounters of the Spooky Kind:
One-Armed Boxer:
Magnificent Butcher:
18 Bronzemen disc from the Cinematic Vengeance set: 
Throw Down:
Wild Search (but I bet now you have the Police Squad! music in your head):