The CEO's awkward, tiny bite of a new burger went viral for its lack of authenticity, initially sparking mockery. However, by leaning into the meme and prompting competitors to respond, McDonald's turned a PR failure into an organic marketing campaign that generated widespread conversation and purchase intent for the product.

In a large-scale Facebook experiment for a chip deal, KFC Australia found the most effective slogan was not a creative tagline but a simple phrase invoking scarcity: "limited to four per customer." This demonstrates that basic psychological principles can be more persuasive and profitable than clever, brand-focused copywriting.

An explicit purchase limit (e.g., "maximum 4 per person") acts as a powerful signal of scarcity and value. It suggests the deal is so good the store might sell out or lose money. An experiment showed that adding a purchase limit to a beer offer increased the perception of it being a good value by 57%.

In a candid moment, marketers acknowledge frequently using "last chance" messaging in promotions even when the offer isn't actually ending. This common practice of manufacturing urgency, while potentially effective, can lead to customer skepticism when used repeatedly.

Marketers often misapply psychological principles. During shortages of items like eggs, imposing a purchase limit frames the item as scarce. This triggers survival instincts and loss aversion, causing people to buy the maximum allowed amount even if they need less, thereby worsening the shortage.

A powerful marketing gimmick involves launching a very small product batch to guarantee it sells out quickly. Brands then leverage this "sold out" status in press coverage to create a perception of high demand and build hype for subsequent, larger product releases.

Chipotle made its popular quesadilla a digital-only menu item because it slowed down the physical service line. This highlights a critical business principle: a great marketing or product innovation that compromises the core operational efficiency of the business is ultimately a value-destructive idea and must be modified or rejected.

Customers are more receptive to optional payments when they believe the money directly supports employees rather than the company. This psychological framing increases participation and goodwill, even though businesses ultimately pay their staff.

Chipotle's "buy-one-get-one" deal for customers wearing NHL jerseys is an "adternative"—a clever stunt or promotion that costs less than a traditional ad campaign but generates significant free press and social media buzz (earned media).