Unbeknownst to Chang, his parents are playing a trick on him by presenting him with a wrapped bar of soap for his birthday. Chang opens the gift and, on seeing the bar of soap, looks over to his grandmother and hesitantly and softly says, "I wanted this soap, grandmother. Thank you!" Clearly, Chang's body language indicates his disappointment in the gift. What likely explains why Chang lied about his enthusiasm for the gift of soap?