When she first got the call, Janet Pullen was certain her nineteen-year-old son was playing a prank on her.
After all, the Craigslist ad she posted last weekend offering to sell a massive "Polar Pop cup collection" was written largely in jest. Free or not, who in their right mind would actually want 1,060 used styrofoam cups?
"I really didn't think anyone honestly was going to take them.…