Glass of Water

Q: Why do Polish men, when they go to sleep, bring one glass full of water and one cup empty?
A: It's because they doesn't know if they'll be thirsty or not.

Polish Eyes

A polish man goes to the eye doctor and looks at the chart - P Z C R K I C H. The doctor asks, "Can you see them?"
The man says, "See them? That's his cousin."

The Polish Navy

Q: Why does the Polish Navy have glass-bottomed boats?
A: So they can see the old Polish Navy.