if you are one of those people that flaps your hands all over when youre talking on your cellphone in the car.
you look like an idiot.
the person you're talking to can't see you.
put your hands on the wheel.

/ pet peeve

you do realize that if the brain is not paying attention to the hands, it doesn't matter where the hands are, right?

your description for some reason made me think of:
https://youtu.be/9jmF900DHKk?t=21s