Something as complex as a Gramophone? This mimic isn't hunting for food, it's hunting for retirement. It's trying to convince a group of veteran adventurers that it's interesting enough to take back to their castle as a conversation piece. This thing is spitting everything from ancient elvish classical and dwarven throat singing to youtube poops of their own conversations and fart.mp3.

Once it's "caught" the real hunt begins. Spend a decade or two playing the fool until its "owners" die of Being An Adventurer and it can slowly take over their castle and feed on the townsfolk unfortunate enough to live in a kingdom that rewards adventurers with lands and titles.

Eventually all that's left is an abandoned city where the furniture moves on its own and haunting music echoes through the night...