A Slip Of The Tongue Once, in my oral English examination, the teacher asked me if I had ever made something by myself and I told him that I had made a birthday card for my mother. Then he asked me to describe it, I said without thinking,’Its oval, it's 30 cm in diameter.’ After hearing this, the teacher began to laugh. I asked him why he laughed, and he answered,' You made such a big mistake.’ I didnt understant, thinking I did not make any mistake. After finishing the oral English examination, I was still thinking what the mistake was. Suddenly, I understood. What a big mistake I made!