A dollhouse that opens its door when you look at it correctly, revealing a secret garden with music. Approach it wrong, and the door slams. When it reopens, the room is empty.

A 1920s cathedral radio that warmly plays old tunes, until it's touched once too often. What happens after that takes about ninety seconds, involves a man in a crisp blue suit, and is easier to watch than to describe.
A stone with a golden disk and three runes. Turn them into the right combination and a dwarf appears. Most people never find it.

A fortune-telling machine that reads your future and offers only bad news. There was always a line.
A dragon who lives in a tent and breathes smoke.
A panel of buttons, lights, and switches that does nothing useful. Solving it doesn't give you an answer. It gives you fog.