Antimatter
I always gave my son the same advice: “If you ever meet your anti-self, meaning a creature made of antimatter carrying exactly the opposite electric charge from you, resist shaking hands with him as you will both cease to exist as matter at once”.
My son’s anti-self, however, was a woman… And not only did he fail to resist touching her hand, but he kissed her nonetheless. As a result, happened exactly what modern physics describes so vividly…
“This is how true love looks like”, commented my wife sorrowfully. Indeed, at the time an epidemic of true love seemed to have hit the entire world leading everyone to seek their anti-selves and then dissolve.