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Featured Image Credit: ABC
The tradesman was working on a building site belonging to Mount Cotton State School in the Redlands when he discovered the whopper moth.
But while it may be the stuff of nightmares for some, the school is delighted with the find and has shared snaps of it on social media, calling the discovery 'amazing'.
Principal Meagan Steward said the moth was the same size as 'two fists put together' and was released back into the nearby rainforest - after the took a few snaps, of course.
Queensland Museum entomologist Dr Christine Lambkin identified the creature as a wood moth and told ABC Radio: "They fly very, very poorly.
"In most cases when the females emerge, they just crawl up a tree or stump of a fence post and wait for the males to find them.
"This species ranges from north Queensland all the way through to southern NSW.
"The wingspan of the female is up to 25cm. It weighs up to 30 grams."
Dr Lambkin also confirmed it was the largest species of moth by weight. Lovely.
The doctor went on to say the insects aren't super common, but it isn't too unusual to come across one - especially at the end of summer.
She added: "This particular species is very interesting because we don't know what actually happens for the first year or so.
"The first thing we do know is they're a grub that's about 4cm long and appears on tree trunks, is black and white striped and burrows into eucalyptus trees, then spends a year or so eating away."
Meanwhile, the students of the school used the moth to fuel a bit of creative writing. Ms Steward told news.com.au: "We weren't at school when the builders found the moth but they took some photos for us.
"We have a (year) 4-5 composite class that live in that new building, and the teacher showed the students a picture of the giant moth and they used it as stimulus for a creative piece of writing.
"The class brainstormed what could happen and they decided on a giant moth invasion.
"They wrote some very creative and imaginative pieces of writing, including Mrs Wilson [their teacher] getting eaten by the moths."
Watch yourself, Miss.