This distinguished gentleman was driving a 3,500 gallon tanker truck on the job site which I was assisting in surveying, (by operating the "dumb" end of the chain.)
The tanker was used for "dust control" on the arid New Mexico site, and on the back and sides of the tank in large letters it conspicuously stated
NON POTABLE WATER.
I yelled at the driver as he was slowly driving by, but he did not hear my query.. So he stopped and leaned out the truck and asked "Wha'did you say..??"
I said,
"Say Boss, since that water be non-potable, howse come you be carryin' it around??"
The transit guy (party chief) and I laughed our asses off, but the driver just shook his head and drove off..
HAPPY NEW YEAR