I think lasers are pretty wack when you think about them through this lens. A small, wand-like object in your hand can make light appear from seemingly nowhere. If it’s powerful enough it can set things on fire or blind people. Not to mention larger ones like laser cutters or the LLD, used to destroy missiles midflight. Thats sure to blow some feudal peasant minds
l can think of one magic-technology that appeared during my lifetime:
E-Ink-Readers.
I mean, script suddenly appearing out of thin air on flat, solid surfaces? WTF?
I even studied enginering in the early 90’s and would not have been able to come up with a technological explaination if I had encountered one of those back then…