What sound does a Polish crow make?

Krakow

What sound does a debugging Web Developer make?

Open, Close!.................. Open, Close!.................. Open, Close!.................. *only true Web Developers will understand* *original joke*

What the sound of a rainbow laughing?

Hue hue hue hue

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What is Polish roulette?

It's similar to Russian roulette, but instead of a revolver it's played with an automatic pistol.

What do they call a Polish astronomer?

Copernicus.