What is your best experience One-Uping a sibling?

I was 6 and James was 9, we were in the loungeroom and he was giving me one of those Indian Burns. I told him if he didn't stop and leave me alone I would get Dad to belt him. He gave me a wet-willy and dared me. (A Wet-Willy is when someone slobbers on their finger and sticks it in your ear.) So I yeller "[my name] you F@cking C#nt! I'm going to going to kill you!"
Dad came straight in and grabbed James by the scruff of the neck and he got the Belting I promised. 🤣