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
It’s even cooler than lightbulbs, though (assuming we’re talking about incandescents) - you send electricity back and forth into a wire that’s just the right length, and (RF) light leaks out without it getting hot!