DrakoPensulo: As far as I know, so called "Polish jokes" are result of highly anti-polish propaganda spread in the US by Germans who were able to get here after the World War II. 
  These are common jokes, only subjects change depending on area, plus racial stereotypes. 
 Poland became a joke when it left USSR influence. It was an USSR showcase and became backyard of Europe. 
 Due to its past great empires they are prideful, but current Poland doesn't fuel up this pride. 
 And what prideful without reason immigrant, which doesn't want to learn language of new country, becomes in Europe? Cleaner.  
tinyE: I'm feeling left out. What is a racial slur for a Dutchman? 
  Stoner? 
 Dutch army parade: 
 Militia with smoke grenades 
 Cavalry on giant centipedes 
 Aviation on winged horses.