Out of sight, out of mind

We were at the park watching K's soccer game. There were a couple of ice cream vendors pushing carts around in the park, and D had been clamoring for ice cream, but his mother said no. He tried a few tactics in an attempt to get her to change her mind.
"It doesn't cost any money," he said.
"It doesn't? How do you know that?" we asked him.
He pointed to the cart, which had pictures of ice cream and the name of the company (in Spanish). "See, it doesn't have any numbers on the sides," he pointed out.
His mother didn't give in. "After the game, there's a barbecue," she told him, "with hot dogs and chips and juice boxes."
"I don't want a hot dog," he answered, but this didn't convince her either, and she just said, "OK, but we're still not getting ice cream."
That seemed to be the end of it. But a few minutes later the game was over, and both parents and K started off towards the barbecue at the other side of the park. D decided to wait with us and T, so Mommy said they'd bring back food for us. No sooner were they out of earshot than D, eyeing the ice cream cart, turned to his grandfather and said, "Papa, do you have any money on you?"