Why do people knock on the table three times when they pour you tea?

When someone pours tea for you, the index finger and middle finger of your right hand are close together and naturally bend. Tap the desktop with two-fingered beans, which is vividly called "kneeling with one finger" to show your gratitude.

According to legend, this custom of drinking tea originated in the Qianlong period of the Qing Dynasty. As we all know, Emperor Qianlong visited Jiangnan seven times and was a "fun-loving" emperor. Once he was drinking tea in Jiangnan Teahouse. On a whim, he grabbed the teapot and poured water for the courtiers, which surprised everyone. According to the rules at that time, everything the emperor gave was a reward, and the recipient had to kneel down to give thanks, but in public, he didn't want to. In desperation, a person came up with an idea, which is what it said above. Everyone knelt down and did it. Later, I didn't want to become a tea custom.