Pineapple on pizza is nice. People who say it shouldn't be on a pizza are literally idiots. "It's not traditional." Yet they don't complain about anything else put on a pizza that isn't traditional.
Go to Italy, find a restaurant that is on the square the Pantheon is on. Order a Pizza. Get an ok base, tomatoes and cheese. In one quarter there are 4 olives. In another there's a 2 inch by 2 inch square of ham. In the next there's half a boiled egg. In the remaining quarter, there's half an artichoke. Geez.... A Hawaiian Pizza is infinitely better.