Bald assertion

The hair on my head is a fragile little plant, easily blown about by the prevailing winds, and broken off at the slightest bit of pressure: if I inspect my modest brush, I'll find fragments, sometimes entire strands, that couldn't stand the strain of contact with a thin plastic dowel.

But....

Drop that same hair into the tub drain, and by some alchemy the plumbers' union dares not describe, it acquires the strength of Kevlar, and can be removed only by low-yield explosives or by chemicals that would make Acidman antsy.

Somehow it just doesn't seem right to blame it all on soap.