... which hilariously backfires when the kryptonite ends up in the hands of some cruising criminals, who catapult it right back at Superman. The mini-me eventually sacrifices itself to save Superman from a (well-deserved) death, and he loses his new power.
"Ha, what a dipshit! Now, let's use this restored X-ray vision to spy on old people pooping."
Of course, the real tragedy here is that we never find out if the tiny Supermen could shoot even tinier ones from their fingers, and if those in turn could shoot even tinier ones -- and so on, down to a subatomic level. There are some things man just isn't supposed to know, we guess.