The goldfish had always been rotund but now it was almost too big for its pond and inexplicably floating just above the water. Attempts to push it under failed. It continued to wiggle in the air unharmed.
"Which vial of flakes were you feeding it?" asked the baffled witch.
"The green one by the door," replied one petsitter
"I was using the blue one on the shelf," said the other.
"So, not the one labeled 'fish food' then."
"Our bad!"