DM/Players of Lemmy, what are some silly magical items I should add to a campaign?

Something with a very niche useage like a Wand of Ring Detection; starts with 4 charges and regains 1d4 charges at dawn, expend a charge to become aware of any and all rings within 30ft.

Would usually be useless, until the one time you can use it to recover a lost/stolen ring or become aware of someone hiding their powerful magic item!
Or when they start using it at random and become aware of random little trivia of NPCs around them!

Also, chain mail would be obnoxious to someone using the wand!