The Indestructable John McAfee
Like Charles Montgomery Burns, John McAfee is in delicate state of homeostasis created by the presence in his body of every disease known to man, which cancel each other out. Mr. Burns took this as making him invincible, although the doctor who told him this implied that the slightest breeze could kill him.
In other words, it's also like the average PC running McAfee virus protection software.