Some people, when well-known sources tell them that fire will burn them, don't put their hands in the fire.
Some people, being skeptical, will put their hands in the fire, get burned, and learn not to put their hands in the fire.
And some people, believing that they know better than well-known sources, will claim it's a lie, put their hands in the fire, and continue to scream it's a lie even as their hands burn down to charred stumps.
AYHTDI is also heard when servers need upgrading, cables need to be run, and software needs to be updated or replaced. In other words, virtually any IT work.
It's close relative is "Oh, I see you've got the sample webpages to display. You can have the rest of the system done and in production by Thursday, right?"
And its deadly evil twin, thoughtlessly uttered by the developers themselves: "All I Have To Do Is..."
Some people, when well-known sources tell them that fire will burn them, don't put their hands in the fire.
Some people, being skeptical, will put their hands in the fire, get burned, and learn not to put their hands in the fire.
And some people, believing that they know better than well-known sources, will claim it's a lie, put their hands in the fire, and continue to scream it's a lie even as their hands burn down to charred stumps.
One of my project managers has a bad habit of saying things like "It shouldn't take long" or "It should just be a case of doing...". Worse is when I overhear those words being delivered to our product stakeholders before I've even had a chance to evaluate the problem.
In a previous company our development team manager and lead engineer had a rather heated disagreement with some project managers about a work estimate he'd provided because they believed the Proof of Concept system written by another team would account for 80% of the final production ready product. There was profuse objection when told the PoC worked for a narrow set of use cases but the quality was such that none of it could be used in production. Egos were bruised and strops were had. Bad times.