#1613 1974 · Master Lock Company · Consumer hardware / advertising
Master Lock's entire ad strategy was shooting its own padlock with a rifle
the problem
A durability claim in an advertisement is just words — audiences have no reason to believe a padlock is actually tough
background
By the early 1970s Master Lock competed in a padlock market where every manufacturer's advertising made the same generic durability claims, tough, secure, reliable, with no way for a skeptical television audience to distinguish which claims were true. Advertising research consistently shows durability claims are among the least persuasive ad content precisely because any manufacturer can make them regardless of whether they're accurate.
For Super Bowl VIII in January 1974, Master Lock aired a 30-second commercial with no celebrity, no jingle and almost no spoken claim: a marksman loads a .30 caliber rifle, aims, and fires directly at a Master Lock padlock. The bullet visibly punches a hole through the lock's body. The lock does not open. The tagline, "Tough Under Fire," appears on screen.
what everyone would do
Write compelling advertising copy that clearly and repeatedly states the product's durability advantages, supported by testimonials or written test results, and pair it with strong brand imagery, following the standard approach every other padlock manufacturer's advertising used at the time.
what they saw
A padlock ad claiming toughness is easy to disbelieve. Master Lock loaded a rifle and shot its own product on camera instead — the demonstration was the entire pitch, and audiences believed what they watched fail.
the move
The commercial's entire persuasive power came from replacing an assertion with an unstaged-looking demonstration: rather than telling viewers the lock was tough, it showed the lock surviving the single most dramatic test a padlock could plausibly face, gunfire, and let the visual evidence make the argument advertising copy alone could not. The ad ran through Super Bowls from 1974 to 1983, then continued in variant forms through 1985 and beyond, with Master Lock reportedly directing nearly its entire annual marketing budget toward this single recurring spot rather than a broader campaign. Industry accounts directly credit the commercial's visibility and memorability with driving Master Lock's growth into the world's largest padlock manufacturer: company sales grew from roughly $35 million in 1973 to approximately $200 million by 1994. The campaign became one of the most studied examples in advertising history of demonstration-based persuasion outperforming claim-based persuasion, cited alongside campaigns like Timex's "Takes a Licking and Keeps on Ticking" torture-test ads as evidence that showing a product surviving visible destruction converts skepticism into belief more effectively than any spoken or written claim can.
why it works
The ad worked because it removed the audience's need to trust the advertiser: nothing about the demonstration required viewers to take Master Lock's word for anything, they simply watched a bullet fail to open the lock in real time. This shifted the cognitive burden from belief to observation, and because the test, being shot with a rifle, was more extreme than any way a customer would actually stress-test a padlock, it created a strong implicit inference that ordinary use posed no real threat at all.
the payoff
After its 1974 'Tough Under Fire' Super Bowl spot showed a rifle shot fail to open the lock, sales grew from $35M in 1973 to $200M by 1994.
where it breaks
This mechanism only works when the destructive test is genuinely dramatic, visibly fair, and the product genuinely survives, staging a test the product might plausibly fail risks a catastrophic on-camera failure that would do far more damage than a generic claim ever could. It also depends on having a product attribute dramatic enough to sustain an entire campaign; most products lack a single physical property as visually testable as a padlock's resistance to gunfire, and repeating the same demonstration format for a less inherently dramatic product would likely read as gimmicky rather than persuasive.
what came after
Became a landmark case study in advertising for demonstration-based persuasion, cited alongside Timex's torture-test commercials as proof that visibly destructive product tests build more consumer trust than any spoken durability claim, and the campaign is still referenced in marketing courses today.
references
- [1]The Wild Super Bowl Ads Where They Actually Shot a Lock on CameraRemind Magazine, 2022remindmagazine.com
- [2]Master Lock's Super Bowl Success Has Lasted Over 20 YearsAdweek, 2019adweek.com