Toast

Oscar’s toaster made any bread stuck into it vanish.
“So, where does it go?” asked Karen.
“I have no idea,” said Oscar. “But I’ve had to switch to cold cereal.”
“Does this happen with bagel halves, too?” asked Karen. “Or just toast?”
“I don’t eat bagels” said Oscar. “Just toast.”
Karen bought some bagels, sliced one in half, and stuck it in the toaster.
She waited for a minute, and the bagel halves popped out.
“I guess it’s just bread,” said Karen.
Oscar shrugged and went out to buy a new toaster.
He smashed the old one with a hammer.