O ... is not 0 ... 0 is not O ...

• 爸爸: You go to bed at seven three 'O', okay?
• 哥哥: You cannot say 'O'. It's zero. 'O' is a(n) alphabet. Zero is a number. They are not the same. Say seven three zero, okay?
• 爸爸: Oooh! Okay, okay ....

• 爸爸: I have been saying 'O' for a long time leh.
• 妈妈: Time to stop using shortcuts liao. LOL

So, what about you? Did you say 'O' or zero? *wink*