Excuse me while I relax and put my feet up on McCain’s medulla oblongata.

Tread lightly, Charles. You might affect his heart function.

Oh, wait…

While you’re there, look around for the amygdala. There should be two, one in each cerebral hemisphere. Shaped like almonds, as the name implies.

I suspect he doesn’t have any. They control the sense of smell, and if they were present, they might alert him to the stench of the company he keeps.