The award-winning "Ghost Chips" drink-drive advert has been credited with having an unprecedented impact.
The clip was aimed at young Maori males, but a study found more than 90 per cent of people remember the ad when prompted.
Three quarters of those who recall the ad said it was likely to stop them from drink-driving.
The figures are from research carried out by the New Zealand Transport Agency and released to the Herald on Sunday. NZTA spokesman Andy Knackstedt described the result as "off the charts".
But the campaign's success has shown up a few of the not-so successful campaigns.