You cannot drive the car if you do not have a driver's license. You cannot do brain surgery if you are not a brain surgeon. You cannot even do a massage if you don't have a license.

Economics is not brain surgery.

Fashion and style is just that. Fashion and style. It's not brain surgery.

I never thought make-up was like brain surgery.

I tell public audiences, don't go to a podiatrist for brain surgery; don't go to an astronomer for planetary science.

Let me put it this way: I don't plan to retire. What would I do, become a brain surgeon? I mean, a brain surgeon can retire and write novels, but a novelist can't retire and do brain surgery - or at least he better not.