I know you are just being funny, but think about it. It's the math. 18% is a reflection density of 0.74. Add three stops and that equals an RD of -0.18 or 144% Reflectance for Zone VIII.

This is simply putting numbers to the Zones. If not 144% then what?

From Bill Burke

This is for a normal 7 stop scene when Zone V is at 18%.I don't have a problem with it because it might assume a long range subject