What are some good Polish jokes?

A Polak wanted to learn how to sky dive. ...

...He got an instructor and started lessons. The instructor told the Polak to jump out of the plane and pull his rip cord. The instructor then explained that he himself would jump out right behind him so that they would go down together. The Polak understood and was ready.

The time came to have the Polak jump from the air plane. The instructor reminded the Polak that he would be right behind him. The Polak proceeded to jump from the plane and after being in the air for a few seconds pulled the rip cord. The instructor followed by jumping from the plane. The instructor pulled his rip cord but the parachute did not open. The instructor, frantically trying to get his parachute open, darted past the Polak.

The Polak seeing this yelled, as he undid the straps to his parachute, "So you wanna race, eh?"