There are several theories about the origin of this stalk. One of them is that Sam Pano Polosse, a Canadian born in Greece, invented pineapple pizza and opened a restaurant in Hawaii to promote it. Another way of saying it is that Hawaii has just become the newest state in the United States, and pineapple is made from canned pineapple in Hawaii, so it has this name.
In any case, pineapple pizza has aroused strong dissatisfaction among Italians, because they think pineapple and pizza are completely incompatible, and pineapple is not an Italian product. They think this is a kind of trampling and offending to the pizza and food culture originated in Italy.
So, if you want to annoy Italians, order them a pineapple pizza!
This stalk is generally used in the following situations or scenes:
When you want to spoof or provoke Italians or pizza lovers, you can deliberately order a pineapple pizza, or take photos of pineapple pizza on social media with provocative words, such as "pineapple pizza is the best pizza" and "Italians don't know what food is".
When you want to express your disagreement or disgust with something or an opinion, you can use pineapple pizza as a metaphor, for example, "This policy is as disgusting as pineapple pizza" and "Your opinion is as unreasonable as pineapple pizza".
When you want to joke or make fun of something or an idea, you can use pineapple pizza as an irony, such as "I like pineapple pizza best, just like I like watching you laugh best", "You are a tasteful person, just like eating pineapple pizza" and so on.