In the Warring States Period (zhàn guó 战国), the State of Qin besieged the capital of the State of Zhao. Duke Pingyuan of Zhao planned to ask the ruler of the State of Chu personally for assistance. He wanted to select a capable man to go with him. A man called Mao Sui (máo suì 毛遂) volunteered. When the negoti-actions between the two states were stalled because the ruler of Chu hesitated to send troops, Mao Sui approached him, brandishing a sword. At that, the ruler of Chu agreed to help Zhao, against Qin. This idiom means to recommend oneself.

In the Spring and Autumn period (chūn qiū 春秋时期,770-476 BC), a thief had stolen a bell and intended to carry it away on his back, but the bell was too bulky and heavy to be carried, so he tried to break it into pieces with a hammer to make it easier for carrying. On his first hit, however, the bell made a loud noise. He thus feared that the ringing sound might be heard by someone, who would come to rob him of his bell. His fright made him plug his own ears, while hitting the bell with the hammer. The bell sound was, nevertheless, audible to others and therefore to stuff his ears for the purpose of stealing a bell was a stupid action it is as foolish as burying one's head in the sand.