Wasn't expecting to see this here. I created this article about 10 years ago, when I was a lot more active on Wikipedia. Every time I remember this article I keep expecting it to get deleted sooner or later, but somehow it's made it this long. Mostly a matter of finding and adding enough references that mention the phrase I guess. (Some of the recent additions don't…)

One thing I'll point out is that the effect as originally described is about things that always existed in their place of origin, but became more popular / accepted (improved in reputation) after gaining a warm reception/prestige elsewhere. (The examples here of things popularly associated with X culture despite not originating in place X are interesting too, though!)

Edit: Sorry for a tangential aside, but I just looked into the history of this article, and IMO it's representative of many Wikipedia articles (and not how either the general public or Wikipedia regulars think articles get written):

• Here are the first 3 years, where basically things were cleaned up and a couple of examples added, but the article was still substantially in its original (poor) form: https://en.wikipedia.org/w/index.php?title=Pizza_effect&type...

• Then a single edit by another user substantially “refactored” it and cleaned it up: https://en.wikipedia.org/w/index.php?diff=585383004&oldid=58...

• Another 6 years where nothing much changes fundamentally, except for a few additional examples: https://en.wikipedia.org/w/index.php?diff=943600315&oldid=58...

The article has 102 revisions, and all of them have contributed to its present form… who would we say “wrote” it? See the late Aaron Swartz's “Who Writes Wikipedia?” at http://www.aaronsw.com/weblog/whowriteswikipedia