What's funny about $\forall \forall \exists \exists$? 
So, what's the joke in number $9$?

$9$. You understand the following joke: $\forall \forall \exists \exists$


What struck me (personally) as droll was:


*

*It can be construed as redundant, in that two "for every" clauses in succession can be replaced by a single "for every", and similarly for two successive "there exists" clauses.

*It looks like the cry of a cartoon character falling upside down from a great height.
After reading the existing responses here, I lean toward the interpretation "whenever you see a $\forall$, a $\exists$ lurks nearby", a wry comment on epsilontics.
