For me it was this ad, for Swedish typewriter maker Facit, back in 1982. My father subscribed for this weekly news magazine here in Brazil and I used to browse through their pages when they were delivered. I was doing that when I found it. I was 7 in 1982, and I can surely say it has left a permanent imprint on my mind!
The ad goes: "The strong swedish" and, then "Now, say if she isn't pretty"
Beautiful story