True story- while I had heard of it before, the first time I distinctly remember seeing pineapple offered on pizza as a topping was when I was doing a west coast swing in 1991. That's not to say it wasn't around before that, but the 1980s marked a seachange in food habits in the United States, and the difference between 1980 and 1990 (for example) was already vast. This shocks a lot of people today, but in the late 80s, you literally couldn't find bagels in most parts of the country (other than maybe frozen Lender's bagels).