McDonald’s: Save the Sundae Cone

A melting cone that asks the street to help

Summer is here and McDonald’s is back with an interactive outdoor campaign built around one simple problem. A giant LED billboard in Bukit Bintang, one of Kuala Lumpur’s best-known shopping districts, showcases the iconic Sundae Cone. But it is melting.

To save it, people use their smartphones to spin a fan on the billboard, bring the temperature down, and stop the cone from disappearing.

The mechanic: one shared control, one visible outcome

The execution translates an abstract idea, “cool it down,” into a single piece of viewer control. You open the experience on your phone and spin a fan. The billboard responds in real time. When more people join in, the cooling effect accelerates, so the experience naturally becomes collaborative rather than solo.

In some write-ups, participation is also rewarded with a Sundae Cone e-voucher that arrives on the phone, adding a clean payoff to the play.

In high-footfall retail districts, interactive DOOH, meaning public digital screens that react to what people do, works best when the action is obvious, social, and instantly rewarded.

In high-density urban retail districts, the win is not interactivity by itself but a public action that converts attention into nearby store traffic.

Why it lands

It is instantly legible from a distance. Something is melting. A crowd can fix it. Because the phone gesture maps directly to the visual problem on the screen, people understand the task instantly and the crowd can follow the result without explanation. That clarity creates a low-friction loop: notice. join. watch the shared progress. earn the reward. The “melting” constraint also adds urgency without needing any heavy messaging, and the big screen makes every participant feel like they are influencing something larger than a banner.

Extractable takeaway: If you want people to interact in public, reduce the mechanic to one familiar gesture, make the result visible to everyone, and design the reward so participation feels worth it even for a 30-second engagement.

What McDonald’s is really buying

The real question is whether the screen can turn public play into store-proximate action before attention drifts. This is a strong retail DOOH execution because the interaction, the product promise, and the path to redemption all reinforce each other. This is not only awareness. It is behavior. Get people to take out their phone, do a playful action tied to heat and refreshment, and then convert that attention into a reason to walk into a nearby store. The billboard becomes a live demo of “cool relief,” not a static claim.

What retail teams should borrow

  • Design for crowds first. If spectators cannot immediately understand what participants are doing, participation stalls.
  • Make progress collective. Shared outcomes create social proof and naturally recruit more people.
  • Keep the gesture native. One simple interaction beats a clever multi-step flow in outdoor environments.
  • Tie reward to proximity. If you can convert engagement into a nearby redemption moment, the media becomes a traffic engine.

A few fast answers before you act

What is “Save the Sundae Cone”?

It is an interactive digital out-of-home campaign in Kuala Lumpur where a billboard shows a melting Sundae Cone and invites the public to cool it down using their smartphones.

How do people control the billboard?

They use their phone to spin a fan mechanic that cools the on-screen temperature. More participants increase the effect, making it collaborative.

Why is the melting mechanic effective?

Melting creates urgency that anyone understands, and it turns participation into a visible “save” moment the crowd can watch.

What makes this a strong example of interactive DOOH?

The action is obvious, the feedback is immediate, and the experience becomes social because progress is shared on a large public screen.

What is the key takeaway for other brands?

Use one native gesture, show real-time feedback in public, and reward participation quickly so interaction feels like a fair trade.

Coca-Cola Peace Machines

Small World Machines. India and Pakistan meet through a Coke

Over the years Coca-Cola keeps experimenting with vending machines and tries to make them much more than the average soda-spitter-outer. It places two machines, one in India and the other in Pakistan, and turns them into a communication portal. These “Small World Machines” allow citizens from both countries to interact with each other and complete shared tasks. Here, “shared tasks” means actions designed to be completed together, not alone. The machines reward them with a Coke. The results…

Fair Play Machines. Inter and Milan fans can only give to rivals

The success of that has inspired Coca-Cola to once again bring fighting parties together. Now instead of bringing together nations at odds, it has tapped into the rivalry between Italian soccer teams Inter and Milan.

To ease the aggression between the fans, Coca-Cola installed their “Fair Play Machines” on opposite sides of Milan’s San Siro stadium as the teams faced off. Pressing the button of one machine dropped a Coke can down the chute of that on the side of the rival team. So this way rivals could only receive Cokes from each other. The results…

The real question is whether you can design an interaction where the easiest way to get your reward is to give something to the other side first.

In global consumer brands, especially when audiences are polarized, experience rules travel further than slogans.

What this teaches about “peace” as a design problem

The strongest move is not messaging. It is creating a constraint that makes cooperation the easiest path to a reward. A constraint is a built-in rule of the experience that limits options so the intended behaviour becomes the easiest one. This works because the reward is gated behind a cooperative act, so the social friction becomes part of the game instead of a barrier. When a machine encodes that rule, behaviour shifts without anyone needing to preach.

Extractable takeaway: If you want two sides to act differently, stop asking for goodwill. Change the rules of the interaction so the smallest “yes” becomes the default move.

Design moves you can borrow from Peace Machines

  • Gate the reward behind a give-first action. Make the path to getting something run through giving something to the other side.
  • Keep the rule legible in one glance. If people need an explanation, the moment is gone.
  • Turn tension into a shared task. Use a simple co-action that feels like play, not reconciliation.

A few fast answers before you act

What are Coca-Cola “Peace Machines” in this context?

They are vending machine concepts that turn a simple Coke transaction into a social interaction, designed to reduce tension between rival groups.

What is the core mechanic of the Fair Play Machines?

Pressing the button on one machine sends a Coke to the machine on the rival side. Rivals can only receive Cokes from each other.

How do Small World Machines relate to this?

They use the same principle. A machine becomes a bridge, enabling people in opposing contexts to interact and complete shared tasks that lead to a reward.

What does “constraint” mean in experience design?

It is a built-in rule that limits options so the intended behaviour is the easiest one to choose.

What is the main design lesson for brands?

If you want behaviour change, build the rule into the experience. Make the cooperative action the trigger for the reward, and keep it simple enough to understand instantly.