Itou Junji Kyoufu Manga Collection - Vol. 10 Ch. 1 - Ice Cream Bus

[MangaDex]

 

[Meduchi]

Ridiculous plot, yes, but it works pretty well for what it is. The final pages with melting children and the son losing his head are genuinely disturbing. Then the last panel just makes you burst into laughing. I'll be nice and assume it was intentional.
Souichi wishes his stories were like this!

 

[Blanche]

that kid was a little shit, anyway