Bi Bi's grandparents organized a birthday party for him, and it was a delightful occasion with many guests in attendance. When Bi Bi arrived home, he was greeted by everyone with cheerful birthday wishes. Filled with excitement, he rushed into the house, warmly welcoming his grandparents, uncles, aunts, and cousins.When the time came to cut the birthday cake, Bi Bi thoughtfully served two slices to his grandparents, placing them on a plate."Congratulations! Please enjoy some cake," he offered with a smile."Bi Bi, you're showing such good manners today. You seem especially lively and agile," remarked his father.His father then reminded him, "Bi Bi, it's your turn to have some cake!""Yes, Dad!" Bi Bi responded eagerly.As Bi Bi lifted the cake to take a bite, it unexpectedly slipped from his grasp and landed back on the plate. He couldn't figure out why it kept happening.Bi Bi's father inspected his hands and asked, "Let me see your hands, Bi Bi."Bi Bi extended his hands in front of his father."Oh dear... Your hands are a bit dirty, and the cake seems to be a bit jittery around them. It keeps slipping away. Go wash your hands!"Looking at his hands, Bi Bi noticed some purple ink stains and even a few paint marks. He quickly headed to the bathroom and thoroughly washed his hands with soap. When he returned to the living room, he cradled the cake in his hands and was delighted that it stayed put. He brought it closer to his mouth, but as it touched his lips, it inexplicably leaped back onto the plate. Bi Bi couldn't understand why the cake was being so mischievous today. He tried again, but the outcome was no different. In frustration, he decided to firmly hold the cake with both hands and bring it to his mouth. Strangely, even though he had a firm grip on the cake, it resisted him, pushing his hands away, preventing him from taking a bite."Oh no, what's going on!" Bi Bi suddenly reminded.Setting the cake down, he said, "Dad, please take a look! I played a game with lots of colors in my mouth. Dad, check if it's true!""That's it! Bi Bi, you've figured it out. Well done. Go and clean your mouth!" his father acknowledged.In the bathroom, Bi Bi saw the colors swirling around on his lips in the mirror and was startled. It all made sense now—no wonder the cake kept resisting him!His father moistened a cloth with warm water and gently wiped Bi Bi's mouth, causing the colors to disappear.This time, the cake behaved obediently, and Bi Bi savored every bite. Without waiting for his father's reminder, Bi Bi made a promise to himself, saying, "From now on, before I eat, I'll wash my hands and clean my mouth. Only then can I truly enjoy my food." At that moment, applause filled the room, and Uncle Hung shouted, "Let's invite Bi Bi to the best seat so we can all congratulate him and present our gifts!"

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