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What have I done to you, pen?
(feddit.de)
He looked over to his guest, sitting opposite him on an old wooden chair. A traveler from a far away land, lost in these dark forests in this dark and stormy night, glad to have been given shelter. The man - he could not be older than thirty - had bowed profusely after his rescue from the elements.
"I could never repay you completely for you help, but may I offer you a small token of thanks for your kindness? It's a game from my home, quite simple to play, it would be an honor to teach you. I have not seen its likeness in these lands, so it might offer you a sliver of fresh entertainment."
Vacuum decay, or vacuum metastability event is the possibility in simple terms that the universe itself is not in in its ground state. If that's true, it might spontaneously change to its real ground state. Doing so will change fundamental things like the strength of electromagnetism, the weight of particles and so on. It would literally destroy everything in the universe, and we couldn't exist in what's coming after.
Good news, we're confident, that's probably not going to happen.
https://en.wikipedia.org/wiki/False_vacuum