Popped into my local KFC today. Due to the area I live in, they have screens up between customer and cashier (like in post offices and banks), which makes it hard to hear what is being said. I didn't understand what the girl asked me, and, as I often say when I don't understand what someone has said, I jokingly said "Can I have that in English please", without thinking/realising/noticing the cashier was from another country (english being her second language).
The cashier got very upset. More upset than I would have thought is necessary, and refused to continue to serve me. I was shocked. She got her manager and told her what I had said. To cut a very long story short, I have been banned from the store.