It started in 19 century when a lot of poor uneducated Polish peasants (like most people in every other country in Europe at that time) immigrated to USA. They were most visible cos they come in greatest number. So they were an easy target. And every country need a village’s idiot so here we have it.
Why should you never laugh when you see a Polish guy smashing a car into a tree? A. It might be yours.
Why do Russians steal two of everything whenever they""re in Germany? A. They have to cross Poland on the way back.
A Polish and Russian guy are in a car together, who""s driving? A: The Police.
Snad tady není žádný Polák...