Sad Sack of a Sacker

Ronnie held the dented can in his hand. Just a few seconds earlier, it had rolled out of its sack, fell through a hole in his cart, and rolled under his foot.
Ronnie counted to ten and took a deep breath.
“Excuse me,” he said to the sacker. “This fell out.”
“So?” said the sacker.
“Can you get me another one?” asked Ronnie.
The sacker sighed deeply, turned around, and shuffled off to the Canned Vegetables aisle.
Three minutes later, he returned with a fresh can.
“Now shove it up your ass,” said Ronnie, pushing the cart out the door.