The Belgian whose car he hit was upset, as it was severely dented and the Dutchman was clearly at fault. But the Dutchman, unwilling to pay for the damages, managed to calm him down by explaining to him how to remove the dents: "Just blow into the exhaust, and the dents will pop out in no time". So the Belgian starts blowing and the Dutchman leaves. Ten minutes later, a police car stops to see what is happening, and the Belgian explains. But the Belgian policeman gets upset, exclaiming that "No wonder the Dutch think we are stupid. This will, of course, never work". "Why not?", the Belgian driver asks. "Because your windows are open, you idiot", the policeman answers.
(Background for those not from The Netherlands or Belgium: good-humored rivalry between the two countries has produced many jokes with the Dutch calling the Belgians stupid, and Belgians calling the Dutch cheapskates)
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