all bodies of earth fill up with high-pressure lava, then split simultaneously. most of planet earth's surface is covered with a thin of lava. then the process repeats itself. humanity is ruined, but not as dramatically as you'd like.
all objects you own now talk to you. constantly. in welsh. or hebrew if you know welsh. or swahili if you know both of those. your clothes self-clean slowly and all other objects self-dirty really quickly. anything eating-related dirties as if it has been in a sewer, anything not dirties as if it has been in a furnace.
seeing some of my favourite podcast people - the only roleplayers except grimithR i've ever watched to the end of a long campaign - assemble into a weird polyamorous thing, it makes me simultaneously envious and weirded out. same as when zefrank describes the chewing apparatus of a mantis. i wish for the ability to swap anything of my own with an equivalent from any other living being on touch as long as they are willing or unable to resist. this includes stuff like body-parts, which scale appropriately, and attitudes; and what is swappable is based on my understanding of the concepts. i can reverse the trade whenever i want, and both will return to their original owner precisely as they were when the initial trade occurred (i trade my concept of love for that of another person, then develop from that origin, then give it back=they get it back like it was when we traded. i trade a wound for the unharmed skin of another, then reverse that for some reason=my wound is still as fresh as it was when traded. i trade my appearance for that of another, then reverse=we both look like we did when the trade happened.). i can trade away things i've traded for as well.