This happened when I was in my first year. It was the first month of college and I had just started as a good student.
I was writing some observations in class. Suddenly a girl from my class whom I knew but hadn't spoken with before came near me and asked for my number.
I was surprised, confused, and at the same time, I wanted to look cool, confident, and charming. Just when I was telling her the first 5 digits of my cell phone number. Immediately she said that I was asking for your Roll No.