Smart boy

Juku's father is playing poker with his friends in the living room. There is a large sum of money in the pot, and a serious bid is being made. At that moment, 4-year-old Juku runs up to his father, looks at his cards and asks: "Daddy, daddy, are four aces good?" "Yes, son..." the father answers in a whisper. The other players quickly throw down their cards, and the father sweeps the money in the pot in front of him. "Too bad, dad," Juku continues, "you didn't have those aces..."