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A woman got the shock of a lifetime when a two-inch long goldfish she won at a carnival grew into a 12-inch monster - which gobbled up the rest of his other fishtank brethren.
Alexandria Miller, from Chicago, US, had thought Gerald was just a regular goldfish when she won him in July 2018.
But she quickly realised that she was dealing with something much bigger when he wouldn't stop growing, outgrowing two fish tanks and costing her a whopping £1,000 ($1,200).
The lively fella has even had to be kept away from other fish for fear he might eat them up, too.
Speaking about her big boy, the 37-year-old said: "When I first got him, he was in a plastic bag and was just under two inches.
"He just looked like your regular goldfish and I thought they grew to their environment so I was expecting him to just stop growing, but within a month of me having him he was already getting bigger.
"He does lay around a lot but it seems when he's bored or hungry, he jumps out of the water and likes to grabs the thermometer inside his tank.
"He'll click it against the glass till he's got our attention - he's food motivated but can be calm until he's hungry.
"Then he seems to get grumpy towards me - but if I put a smaller fish in there with him, he will eat them, which he has done several times."
And a stunned Alexandria says she has given up trying to guess how big he will eventually become, because he shows no signs of stopping growing any time soon.
She went on: "He's so hard to measure - even when we were putting him in his new tank, my friend commented on how much bigger he looks in the flesh.
"I can't hold the tape measure next to him, and after moving him into the big tank he won't even let me touch him.
"I've been luring him to the glass with food to try and get his size.
"We think he's about two years old but we've got no way of knowing for sure - and some people think he's stopped growing but I'm not convinced."
Let's just hope old Gerald doesn't grow quite as big as this next fella, eh?
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