Shopping with only shoe

Today we went to Mahkota Parade's Osim counter with my sister and Hong Zheng's cousin. Hong Zheng climbed into my sister's car on his own. He immediately drop his shoes as he needed to climb on the sofa. So off we went. Upon arriving we just realize one of Hong Zheng's shoe was missing. No choice, we had to shop with only a shoe for about 1 hour. We drove home and realize another shoe was lying on the place when the car was parked earlier on. I only realize he dropped his shoe outside the car since i told him to leave his shoes before climbing on the sofa.