To occupy my nephew for a few hours I asked him to solve a Rubik's cube that had been on the mantelpiece unsolved since 1992, my own childhood. He solved it in a minute, he's still bored, and I am now also resentful.
@BoloMKXXVIII @fesshole I had (I strongly suspect but cannot prove) a co-worker's child do that to one of my cubes.
I started to get annoyed, but then realized that I owned two more cubes, and having a permanently solved one was a comfort some days.