That's not really a joke though? There are lots of curries that were invented in the UK and the British are actually the ones that introduced curry to most of the world and the curries you get pretty much anywhere outside of South Asia are British curries or based on British curries.
To be honest, pizza in its best known iteration originally was from Naples and parts South. When Italian-American GI's (most were descended from immigrants from Southern Italy where they had pizza) were helping to rid Italy of Nazi's during WWII, they were aghast that places North of Naples didn't have pizza. These formerly pizza-free zones then started making pizza to sell to the GI's and thus to this day you can find pizza even in places as North as around Lake Como. So pizza is more American in Northern Italy than it is Italian.
very possible for a region to validly claim a certain iteration of a food, even if it originated elsewhere.
for example, anglo-indian food would not exist without british influence. in the same fashion, american pizza, hamburgers, american-italian beef and US “chinese food”, while not utterly distinct from their precursors, are iterations of the cuisine that would never have come about in their countries of origin.
Youre kind of making my point. My point was much more "if you think that's bad, you should see this" as opposed to "it can't be done." For example, the curries from the UK are very different to anything youd get on the Indian sub-continent.