Arthur C. Clark once said "Any sufficiently advanced technology is indistinguishable from magic". What technologies do we have today that would look like magic to people from the past?

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