When you must say see you

Maggie, my ex-colleague, told me this. Her customer, Mr. Chee, is very particular about how people greet him goodbye. Stupidly, I didn't get her immediately then I asked her why. A bit irritated by my slowness, she then demonstrated "Thanks, Mr. Chee. Bye!". Hehe...I finally knew what she was trying to tell me and we both laughed. Seriously, I can't remember if I ever sounded rude to any Mr/Mrs/Ms Chee before. :p