This is what happened...

My school's classes are called civics group (CG) and I am in the CG 1S20. So one day during my break, someone asked me, "Bing Rong, what is your CG (civics group)?"

So without even thinking, I just replied, "B20!"  The person was looking at me with a weird expression. 

Still thinking that nothing was wrong, I said, "Ya." Then I realised that she was actually asking for my class! 

So I tried to cover up my mistake, by saying, "Oh.. I mean S20, ya."

So that's all, very LB right? HAHA! B20 is the best!