147: The Peak-End Rule: Why the Last Three Seconds of Your Ad Matter More Than Everything Before Them

Framework Sunday: Kahneman's discovery about how people actually remember experiences — and what it means for your creative.

Hey everyone, Chase here from CreativeOS - and I’m excited to share something I just learned this week.

In the early 1990s, researchers ran a study that sounds more like a prank than a psychology experiment.

They asked participants to submerge one hand in 57°F water for 60 seconds. Painful.

Then they asked them to do it again — but this time for 90 seconds. The last 30 seconds, the water was warmed very slightly. Still cold. Still uncomfortable. But less so.

Then they asked participants which trial they'd prefer to repeat.

Most people chose the 90-second trial.

Sixty seconds of identical pain, plus 30 additional seconds of discomfort. But because it ended better, people remembered it as less painful overall.

This is the Peak-End Rule. And it changes how you think about every piece of creative you make.

What you'll learn:

• The research behind how people remember experiences (it's not what you'd expect)

• Why your final frame matters more than anything that came before it

• How to apply Peak-End thinking to ads, landing pages, and email sequences

The Research: Kahneman's Experiencing vs. Remembering Self

Daniel Kahneman — the same researcher behind Loss Aversion — spent years studying a specific paradox: the way we experience something in the moment is almost completely disconnected from how we remember it later.

His conclusion: We don't evaluate experiences. We evaluate memories of experiences.

And memories aren't averages. They're summaries built from two moments:

The peak — the most intense point of the experience, positive or negative.

The end — how it concluded.

Everything in between is largely discarded.

The colonoscopy study made this painfully clear. Patients who had a slightly extended procedure — but with the scope held still at the end to reduce discomfort — rated the entire experience as less unpleasant than patients who had a shorter but more abruptly ended procedure.

More total discomfort. Better memory.

The lesson: Duration doesn't determine perception. The peak and the end do.

What This Means for Ad Creative

Most creative is built to maximize the middle.

Strong visual throughout. Good copy throughout. Consistent product shots throughout.

But the Peak-End Rule says your audience is doing math on two specific moments:

Peak: What was the most emotionally intense frame? The most surprising visual? The most resonant line?

End: What was the last thing they saw or heard? Where did the creative leave them emotionally?

If your ad ends with a logo lockup and a phone number, that's what they'll remember about you.

If it ends with the feeling you want them to carry into their day, that's what sticks.

The Two Creative Questions You're Not Asking

Before you ship any piece of creative, ask:

"What is the peak moment?" Where does the ad hit hardest? Is it designed, or is it accidental? Most brands have peaks by accident — a line that happened to land, a visual that happened to resonate. Peak-End thinking makes this intentional.

"What is the final emotional state?" Not the final frame. The final feeling. After someone watches this ad, what are they left with? Curiosity? Warmth? Urgency? Confidence? Vague awareness that a product exists?

If you can't answer both questions clearly, the creative isn't finished.

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Peak-End Applied: Format by Format

Video ads Design your hook to create the peak in the first three seconds. Then end on an emotional resolution — not a product shot. The customer who remembers feeling something at the end of your video is more likely to convert than the one who just saw your logo.

Static ads The headline is the peak. The subhead or CTA is the end. Most brands write the headline well and then throw away the end with generic CTAs like "Shop Now." Write toward a feeling: "Start Monday different." "Finally, a solution that lasts."

Email sequences The final email in a welcome sequence shapes how a subscriber remembers joining your list. Most brands waste it with a promotional push. A better last email: a story, a value piece, something that makes the reader feel good about being there.

Landing pages The testimonial section at the bottom of your page is the end of the experience for most visitors who scroll. The quality of that section — the specificity, the emotion, the before/after — determines how your brand is remembered by everyone who doesn't convert on the first visit.

What We Learned

1. People remember peaks and endings, not averages. Duration doesn't determine perception. The most intense moment and the final moment do.

2. Most creative wastes its ending. A logo lockup and a tagline is a missed opportunity. The last frame should do emotional work.

3. Peaks should be designed, not accidental. Identify where your creative hits hardest and build toward it deliberately.

How to Apply This Week

1. Watch your last three video ads with one question: What is the peak moment? Is it intentional? What's the final frame? How does it leave someone feeling?

2. Rewrite your CTAs as emotional endpoints. Instead of "Shop Now," write toward the feeling on the other side of the click. "Start Monday different." "Get the version of this that actually works."

3. Audit the bottom of your landing page. The last thing a visitor sees before they scroll back up or leave is your end moment. Is it doing Peak-End work? It should be your best testimonial, not your fine print.

Keep Creating,

Chase Mohseni

P.S. Callouts:

• Sign up for our events calendar & join us this Tuesday at 11am PST for Creative Playbook - where we work through Ad , Landing Page, and Email Creative, sharing what’s working in market.