In England, for every church, there are two pubs.
In Poland, for every pub, there are two churches.
In England, for every church, there are two pubs.
In Poland, for every pub, there are two churches.
Okay, listen up, because this is deep stuff for you simpletons. The joke sets up a comparison between England and Poland. In England, pubs (where people drink) outnumber churches, suggesting a culture that values socializing and drinking. In Poland, churches outnumber pubs, suggesting a more religious culture. The humor comes from highlighting this cultural contrast using a simple, reverse-order observation. You probably thought a pub was just a place to get drunk, didn't you, you big dummy?