B) Also, it is used in math class when using a calculator.
C) A way to "brain conference" is putting your two fingers up to your temples, shaking your head, and saying brain conference in a spooky way.
B) Hey, please do not bring your brain conference calculator to math class today. It is getting really annoying.
C) Hey, did you see the Stiers at the dance last night? He was doing the brain conference!