Pure as the driven snow?
I was walking in between buildings through one of our many above-street tunnels at work today and I looked down and saw an Ice Mountain truck. Under the logo it said "Pure as the driven snow."
And this was the first thing that popped into my head:
Maybe the Ice Mountain advertising people still lived in a world where the average person hops in a horse-driven sleigh to go get groceries or, you know, go to grandmother's house. But when I think of driven snow I think of a brown icey substance in the street gutter that may or may not contain dog pee.
Or human pee for that matter.