For the most part, magic items won't function for a mundane. Sure, the mundane might feel joy and attachement to such an item, or perhaps fear and loathing, depending on the person and the function of the item, but rarely does a mundane recognize and understand as such an item for what it truly is. Most of the world doesn't believe in magic or the supernatural. So, for these people, a magic item that actually operates while in their possession
is either seen as a trick or a special effect, or the person convinces himself that he didn't really see what he thinks he just saw. In some cases, such an event might disturb a mundane to such an extent that psychological harm occurs.