(Almost) everybody likes pizza. Because of its enormous popularity it has undergone all sorts of transformations since it left its home in Naples (see above). The examples are not necessarily typical, but can be found in the country named; they're not even particularly weird. Let's look at some.
In Sweden- curry, banana, pineapple
In Korea- with an outer ring of sweet potato
In Japan- shredded pork, shimeji mushrooms, bamboo shoots, seaweed, shiso (perilla) leaves
In England- balti chicken (whatever that is), green chile, red onion, fresh coriander (cilantro), garlic sauce
In South Africa- chicken, mushroom, mayonnaise, cheddar cheese, spring onion
In India- paneer, onion, peppers, paprika and tomato
In Turkey- anchovy, calamari, shrimp, tuna, tomato
In Holland- mozzarella, smoked wild salmon, capers, red onion, fresh tomato
In Russia- strips of pork, salami, turkey breast, bbq chicken, zucchini, tomatoes
In Hong Kong- seafood, abalone sauce, crayfish, crab roe dressing, chicken, enoki mushrooms
In the Philippines- tuna, white sauce, mushrooms, onions, mozzarella served in a cone
In the United States- grilled chicken, Italian cheeses, Alfredo sauce, scallions