discovering nicknames

Students: "Mrs. Bryant, Christopher is saying his name is Chris. He's LYING!!!!!!"

Me: "Well, boys and girls, he is not lying, Christopher is his full name, but we call him Chris. That is his nickname."

J: "Oh.....well, then I DEFINITELY have a nickname and it's....Beautiful.

All Students: "Ok. Hi Beautiful!!!!!"

*all names have been changed for security reasons (yes, I'm a good teacher like that).