Attribution, please; it being from the yuppie-and-yokel era ought to put bounds on its origin ....

Man in flashy sports car drives up to a ford in the countryside.

Driver: "I say, how deep is this ford?"
Local: "Yur, 'tis only an inch or two."
Driver: "Thanks."

Vroom *vroom* *splash* glugluglug ....
Driver swims ashore and grabs local by the throat.

Driver: "I thought you said this was only two inches deep!"
Local: "Yur, does only come halfway up our ducks."