To put it simply, York peanut butter.
Back in the early sixties there used to be this peanut butter called York. Inside the lining of the lid , there were these octagonal cards of NHL players with a small bio on each player on the back of the cards.
Now at that time, my older brother and I were more interested in sports, the Aaaaaarrrrrrgggggoooooo's being the other team, than my younger brother. It was a good thing that at the time, four of us were going to school, one of my sisters also, so we were going through peanut butter at a good rate. At least a jar a week. so I would get a card usually every other week. So between trading these cards or flipping for them, you could almost get a whole set of Leafs cards. Some players cards were harder to come by than others. For some reason York didn't make as many of the star players cards.
Since that time I've always been a Leafs fan.