Explanation for my lack of understanding: it was past my bedtime.

Blonde: If I didn’t want a beer, I could conclude that not-everyone wants a beer. I don’t know what Raven and Brunette want, however.

Raven: I likewise, cannot conclude that not-everyone wants a beer.

Brunette: Nobody else could safely conclude that at least one person wants no beer. I want a beer. That means nobody can confirm that a person wants no beer. That means nobody wants no beer. That means everyone wants a beer.

How much of this is new to you? If none of it is, how did you not get the explanation? If some of it is, what joke did you get?

If only I could do this in real life. Sadly this would require people to be straightforwardly logical, and that would require sociality not to reward deception.

Counterpoint: if you understand the logic of deception, you can do this kind of thing in real life. The results are depressing, though, precisely because of what they’re effective at.

But I must admit I did not understand your explanation.