Anyone ever seen an odd hose like this?

I agree with Dan that the car would not have come from the factory that way but in a dealer installed situation, anything is possible. I've been a line mechanic at a dealership (and elsewhere) and have seen all kinds of modifications to cover a screwup so the mechanic doesn't have to fess up to management. Maybe the original radiator was badly
damaged during the A/C install and the mechanic had an extra V8 radiator around that he installed with your special hose. Wouldn't be the first time.....