If you ring this number from the Fallout TV show you'll discover a hidden Easter egg

There are so many Fallout TV show Easter eggs included in Prime Video’s adaptation, but the most terrifying actually involves the audience. 

During episode 6, we see Walton Goggins’ Cooper Howard taking part in a Vault-Tec advertisement in one of the flashbacks. It’s an infomercial on what the vaults are, and why it’s so essential to secure your spot ahead of the apocalypse. Near the end of this, he pauses at the camera and urges viewers to call the number on the screen to reserve yours now. 

The phone number is 213-25-VAULT (213-258-2858) and when you’re connected, you’ll hear frantic screaming for several seconds before the call automatically ends. It’s just a short nod, but it’s a hugely satisfying detail given how wrong things go in the vaults very soon after they become usable… You can listen to the full thing below.

Bethesda head and Fallout producer Todd Howard has previously shared how impressed he was by the attention to detail in the show and says it was part of the reason they waited so long to adapt it. "We were really, really patient and once we found that it was very clear to us this is the right way to bring Fallout to the screen," Howard said in a behind-the-scenes look at the Prime Video show praising the production details. "In games, we say 'try to sweat every pixel', they're sweating every pixel on the show."

Indeed, the series applied this to its practical sets too, filming on location rather than using CGI as much as possible. For more on the Fallout TV show, which is now available in full on Prime Video, check out our spoiler-filled guides to the show:

• Fallout season 1 review: "A big Vault Boy-style thumbs up"
• Is the Fallout TV show canon? Here’s what Bethesda’s Todd Howard and the showrunners have to say
• Fallout season 1 ending explained: Hank, Bud’s Buds, and *that* finale location
• When does the Fallout TV show take place on the series timeline?
• Will there be a Fallout season 2?
• The Fallout TV show just revealed the canon origins of Vault Boy's signature thumbs up
• Fallout’s finale may have just answered the centuries-old mystery behind who started the nuclear apocalypse
• The Fallout TV show just teased that season 2 may take place at an iconic location from the games