[andrea_s]

I think I might have met a few, as I am Italian myself :-)

To be honest the story would be much more believable if the writer weren't a foreigner - that kind of reaction from the shop owner is usually reserved for much stronger violations of the "pizza code" (pineapple pizza being the go-to example!)

[Udik]

When I read the title, "the pizza that doesn't exist", I actually thought of chicken pizza. In Italy they would kill you only for suggesting the possibility of it.

[roghummal]

What's wrong with pineapple on a pizza?

[ai_ja_nai]

Pizza in Italy is not a sweet dish. Fruits on it are completely inappropriate, as with pasta.

The only exception is the chocolate, but it's allowed in stuffed pizza only.

[andrea_s]

Nothing, really (if it works for you!). It's just extremely far removed from the usual way pizza is consumed in Italy. I'm usually annoyed by the many culinary debates we like to have (e.g. when should you put cheese on your pasta), but this one I can relate to :-)