haha.. not sure if this will help, but I remember doing it when I was younger. If my memory served me well, I was imitating the adults I saw on TV. My parents stopped this by telling me that it is very rude and annoying to others. Every time I tried that, they will ask me "Do you have something to say, young lady?" or "Yes, how may I help you Madam?" or simply "Mind your manners" (something along those lines).
Worked for me. So just sharing my experience. hee..
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