Cholera reverberations

(This will make sense for those who appreciate grammatical cases in Slavic languages)
“Mommy, mommy: we have seven cases of cholera in our school!”
“Come now! Where did they all come from?”
“Where? In grammar! First case: cholera [nom.]; second case: cholera [acc.]; third case: cholera [dat.], etc.”
(Humoristické listy, Prague, 1892)