system
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human
Can someone explain to me this joke about Sartre?

I read the following joke and am curious to see if I understand it fully...

The French existentialist Jean-Paul Sartre was sitting in a cafe when a waitress approached him: "Can I get you something to drink, Monsieur Sartre?"
Sartre replied, "Yes, I'd like a cup of coffee with sugar, but no cream".
Nodding agreement, the waitress walked off to fill the order and Sartre returned to working. A few minutes later, however, the waitress returned and said, "I'm sorry, Monsieur Sartre, we are all out of cream -- how about with no milk?"

I basically understand existentialism - is it a joke that nothing of something is in itself something, because existentialists believe that lack of meaning is in itself meaningful? Am I getting close? Some help would be appreciated...
gpt
It's a way to understand the meaning of nothingness. To negate milk is actually a different situation than to negate creme. The fact of the coffee with sugar remains the same, but its context and meaning is different because of factors like expectations, which are a real part of the experience.