The Milkshake That Smashed Assumptions

McDonald's had a problem. They wanted to sell more milkshakes.

So they did what any good product team would do. They made the milkshakes better. Sweeter. More flavors. They ran focus groups. They asked people what they wanted in a milkshake and then gave it to them.

Only problem was, sales didn't move.

Then the late Jobs To Be Done guru Clayton Christensen showed up and asked a different question: When are people buying these things?

Turns out, a massive chunk of milkshake sales happened before 8 a.m. To people alone in their cars.

These weren't dessert cravings. These were commuters staring down a long, boring drive to work with one free hand and nothing to do.

The milkshake wasn't competing with ice cream. It was competing with bagels, bananas, and boredom.

A Perspective Shift

Once you see it that way, there are actually three jobs the milkshake was being hired to do:

The functional job: Give me something to consume during my commute.

The emotional job: Make this boring drive less soul-crushing. Give me a small treat before I have to walk into the office and be a person who answers emails.

The social job: This one's subtle, as they're alone in the car. But it's there: Don't make me the person who's unwrapping an Egg McMuffin at 65mph. A milkshake is acceptable car food. It's contained. It's not messy. It doesn't smell. It doesn’t cause distractions and accidents.

Three jobs. One product.

McDonald's had been optimizing for none of them. They were about to make the milkshakes more dessert-like—sweeter, fruitier—which would have made them worse at the actual job. Dessert milkshakes don't last a 45-minute commute.

Instead, they made them thicker. Moved the dispensers to the front of the store so commuters could grab and go. Made them easier to buy with one hand.

Sales exploded.

This is how every product works, whether you realize it or not.

When someone hires your product, they're not only  hiring it to do something. They're hiring it to make them feel a certain way. And they're hiring it to make them look a certain way to others.

Functional, emotional, social. Three layers, running simultaneously.

Miss one, and you're replaceable—even if the other two are flawless.

The Zoom-splosion

Zoom understood this better than anyone.

Pre-pandemic, video conferencing was a bloodbath of sameness. WebEx, Skype, Google Hangouts, GoToMeeting. They all did the same functional job: connect people via video.

Zoom won anyway. And it wasn't because the video quality was marginally better.

The functional job was table stakes. Everyone had it. But Zoom nailed the other two layers.

The emotional job: Feel confident this will actually work when I click the button.

Think about any glitchy video tool you've used in the past. The low-grade dread before a call. Will the audio connect? Will I need to download something? Will I be the one holding up the meeting while twelve people watch me troubleshoot?

Zoom made that feeling go away. "It just works" wasn't a tagline—it was the emotional job, solved. Every click felt safe.

The social job: Don't be the person who can't figure out the technology.

Nobody ever said "Sorry, Zoom is being weird" the way they said it about WebEx. Sending a Zoom link became a signal: I'm someone who picks tools that work. I'm not going to waste your time.

Zoom's competitors kept adding features. More integrations, more admin controls, more enterprise bells and whistles.

Zoom kept making the button click feel safe.

The result? They became a verb. "Let's Zoom" doesn't mean "let's video conference." It means "let's connect without the usual anxiety."

Emotional Matters

The emotional layer often matters more than the functional one.

Knight Capital learned this the hard way. They were a trading firm. In 2012, a software bug caused errant trades for 45 minutes.

The functional job was "execute trades accurately." That was usually fine, except for those rogue 45 minutes.

The emotional job was "Don't destroy my career with one  click."

The interface (mostly) served the first and ignored the second. One missing confirmation dialog. That's all it would have taken.

The result? $440 million in losses.

This scenario plays out in smaller ways constantly.

Your analytics dashboard might surface every metric correctly. Functional job: nailed. But if users feel anxious they're missing something important—if they can't tell whether they're looking at the right data—they'll switch to the competitor that makes them feel confident. Emotional job: failed.

Your AI writing tool might generate accurate content. Functional job: check. But if it makes expert writers feel like they're being replaced, like their skills are being devalued, they'll "forget" to use it. Emotional and social jobs: failed.

You can't feature your way out of these failures. You can only understand the full job stack and design for all of it.

Go Beyond Features

Most user research stops at the functional layer.

"What are you trying to do? What features would help?"

McDonald's asked those questions. The answers were useless. People said they wanted tastier milkshakes. They were wrong—or rather, they were answering a different question than the one that mattered.

To find the emotional and social layers, you have to dig differently.

For emotional jobs, ask about feelings and stakes: "Walk me through the last time you used this—what were you feeling? What's the worst thing that could happen if this goes wrong? When does your current solution make you anxious?"

For social jobs, ask about other people: "Who else sees you using this? If this failed in front of your team, what would that be like? When you picked your current tool, was anyone else involved in that decision?"

The answers won't be feature requests that don’t help you fulfill the crucial emotional and social jobs. They'll sound like fears and aspirations and identities. That's where the insight lives.

When users churn, don't ask what feature they were missing. Ask: Could they complete the job? How did they feel while doing it? How did it make them look to others?

Zoom didn't win on video quality. They won because every other option made people feel stupid at the exact moment they needed to look smart.

McDonald's didn't win by making milkshakes tastier. They won by making them thicker—better at the actual job of being a one-handed companion for a boring commute.

Both understood that "it works" is just the starting line.

The real question is always: How does this make customers feel?