"Why did you buy that fat penguin?"
Translation:Dlaczego kupiłeś tego grubego pingwina?
'tego' shouldn't be a required answer here, only accepted. However, I cannot delete it from the 'best answers', as it actually was the default Polish sentence. Something clearly got pretty mixed up here... Therefore I'm changing the default English sentence to say "this fat penguin" - and then only 'tego' will be correct.