OOmis, I heard something similar which maybe is what you were referring to. A lady was in a toy store store with her child. He ran onto the plastic horse which rides for 25c. No matter how hard she tried, she couldn’t get him off. She talked, she begged, she pleaded, she pulled, but couldn’t budge him.
She turned around, and lo and behold, the world reknowned great child education authority and noted pediatrician, Dr. Edward Goldenstein was right there in the store. She runs over and tells him her problem and begs him for help. He says, I am glad to help, but it will be fifty dollars. She says any amount is worth it. He goes over and very quietly whispers something in the childs ear. He immediately gets off the horse. She asks the doctor, that was amazing, what did you tell him? He says, I’ll need my fee first. She gladly pays him and asks him what did you say? He says, very simple, I told him if you don’t get off the horse right this minute, I’ll give you such a potch that you won’t be able to sit down for a week.