When Kuromi turned the entire adult population of the city into children, we got to see several salary workers and one doctor among them. What happened when people like pilots, drivers, and firefighters got under the wave? In more realistic settings, this little experiment would end in tons of corpses!
Likewise, when Kogure was cursed to run uncontrollably, he could cause a few road accidents, at the very least.
More like fridge grossout, but still - when Masahiko mistook Melody for a sponge, he rubbed her all over his body. There's no guarantee that he hadn't scrubbed... down there with her. Poor Melody probably needed a good washing after that.
In season 1, episode 4, the guy obsessed with trash is said to have "enjoyed his nightmare." But was it really a nightmare? Sure, it was a nightmare for Uta and her family, but HE was on the receiving end of the dream. It doesn't seem, at least from his perspective, that it'd be a nightmare at all.
