“No, you can't!”
“I can, too!”
“No, you can't. You can't PROVE you can, and unless you prove it, I got a perf—”
Roddy stamped his foot. “I can, too!” he shrieked. “You ole durn jackass, I can, too! I can, can, can, can—”
Penrod suddenly stopped his intermittent production of blats, and intervened. “I know how you can prove it, Roddy,” he said briskly. “There's one way anybody can always prove sumpthing belongs to them, so that nobody'd have a right to call them what they wanted to. You can prove it's yours, EASY!”
“How?”
“Well,” said Penrod, “if you give it away.”
“What you mean?” asked Roddy, frowning.
“Well, look here,” Penrod began brightly. “You can't give anything away that doesn't belong to you, can you?”
“No.”