Well we all know how the Germans have trouble pronouncing the letter 'W'. It comes out as a 'V'. The following scenario spells out a possible confusion.
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A cleaner was in the changerooms as a swimmer came in wearing the medal he'd just won.
Puzzled, the cleaner asked, "Didn't I see you competing yesterday in a different sport ? Aren't you a pole-volter?"
"No" replied the swimmer, "I'm German- and how did you know my name ?"