English Heritage
What's good about it
How to use this for your brand
And because it doesn't spell the punchline out, it triggers what psychologists call the Generation Effect, a trick of the brain where we remember things better when we have to work to get to the answer ourselves. That slight delay between reading and "oh! I get it!" makes our brains commit it to memory.
And because that gap also makes us feel clever, we're more likely to share it with friends too. (In fact, in Jonah Berger's Contagious, which is all about which ads and ideas go viral, he specifically identifies social currency as one of the main drivers of word-of-mouth. Basically, we share things that make us look good for knowing or "getting" them.) Basically, it's making a joke that everyone should get feel like a little in-joke between friends. It creates intimacy and a bond between English Heritage and the reader. And that's really smart, because studies consistently find that brands with high intimacy scores (AKA, how much they feel like a customer's mate) outperform on revenue, loyalty, and willingness to pay a premium. SMART. Really smart. Steal this for your brand: if you're going to make a joke or a cultural reference, make it just obscure enough that people feel clever for getting it. Or feel like they share the same cultural references as your brand. Or if you go obvious, undercut it somehow. The trick is to make the reader feel like it's a little in-joke between the two of you. See also: Surreal do this really well. Skyscanner too.