Comically Misidentified Foreign Technology

A character finds Lost Technology and winds up completely, and hilariously, wrong about what it was intended for. Can also occur with present technology if a character is from another time or world, or from a significantly more primitive culture. Often the technology is something real that the audience would be familiar with and immediately aware the character is wrong about, but other methods of revealing the item's true purpose are possible.

Literature

 * In the Touhou short stories collection Curiosities of Lotus Asia, Rinnosuke Morichika (best known for being the only living humanoid man in Gensokyo with a name) has the power to know the name and purpose of an object by examining it, which would come in handy given all the items from the modern world outside Gensokyo that somehow find their way inside it. Unfortunately for him, this power doesn't let him know how to use an item and often leaves out critical details to the point he makes mistakes like thinking a Game Boy is a doomsday device.

Video Games

 * In Shin Megami Tensei IV the player can find "Relic" items which have no purpose but selling. As the protagonist is a samurai from another world, and is traveling through a post-apocalyptic Tokyo, the descriptions of the items found contain some rather off guesses like thinking a hair dryer is a gun, or media discs are mirrors.
 * In the post-apocalyptic game Metal Max 2 monsters will occasionally drop a "Strange Balloon". This item seems innocuous (and is totally pointless aside from its small sell value), but the one with a fixed location in the game world is found in the ruins of what "used to be a hotel named LoveJoy".

Real Life

 * In his autobiography, sakoku born English-Japanese translator Fukuzawa Yukichi (the man on the 10,000 Yen bill) recalls with embarrassment a time he and his companions were served drinks with "strange fragments" floating in them and the various ways his group reacted to them, some trying to chew them, while others swallowed them whole. He was surprised to find out they were ice cubes.