I suppose it triggers off your brain to see if you learnt that trick in a Muggle physics or chemistry class. Same way "it" triggers off your brain to see if you have at least a vague idea of what a spell does before making the magical bats appear.
I'm reminded of the Mage: The Ascension tabletop RPG. In that setting, Paradox forces inflicted very painful backlash on mages who performed magic that a watching "muggle" would find hard or impossible to believe in - so a lot of the game revolved around finding a way for your spells to look like plausible accidents. Cast fireballs near something that could have exploded on its own, give heart attacks preferrably to elderly or overweight targets, and so on.
The Hogwarts anti-tech jinx could be the inverted, less vicious version of it. If Harry gets around to seriously tackle it, perhaps he'll find the solution to be as simple as passing his tricks off as magical artifacts or Charms.
My guess is that the aurors working on it are all as clueless as Arthur and that the project will be a complete wash.
- This thread has run its course. You will find newer threads in the discussion section.
Another discussion thread - the fourth - has reached the (arbitrary?) 500 comments threshold, so it's time for a new thread for Eliezer Yudkowsky's widely-praised Harry Potter fanfic.
Most of the paratext and fan-made resources are listed on Mr. LessWrong's author page. There is also AdeleneDawner's collection of most of the previously-published Author's Notes.
Older threads: one, two, three, four. By tag.
Newer threads are in the Discussion section, starting from Part 6.
Spoiler policy as suggested by Unnamed and approved by Eliezer, me, and at least three other upmodders:
It would also be quite sensible and welcome to continue the practice of declaring at the top of your post which chapters you are about to discuss, especially for newly-published ones, so that people who haven't yet seen them can stop reading in time.