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Christina Kay Thiesen, 33, told troopers that she was driving down I-75 when the unsecured oar flew off of the boat, which was being towed behind a slow-moving motor home.
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Fortunately, she was able to duck, and the oar, which came crashing through her windshield, barely missed hitting her.
An uninjured Thisen pulled over, but the motor home kept on driving.