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MUDr. Pěnička, an incorruptible and honest dentist, constantly has problems passing his driving test. In vain, his wife Boženka looked forward to a trip in a new car. Pěnička did not overcome his nervousness this time either and failed the driving test at the driving school again. When he is alone with an instructor behind the wheel, he drives like a top, but when someone else is sitting behind him, he is nervous and all his skills and knowledge are gone...