This is one of my vary favourite jokes, even though some people don’t seem to find it funny or witty.
The French existentialist Jean-Paul Sartre was sitting at a café table working. A waiter approached him
‘Can I get you something to drink, Monsieur Sartre?’ he asked.
‘Yes, I’d like a cup of coffee with sugar, but no cream’, the philosopher replied.
A few minutes later, however, the water returned and said,
‘I’m sorry, Monsieur Sartre, we are all out of cream — how about with no milk?’
What’s not to love about this? You do not need to know who Sartre was, or what he stood-for or wrote about. The joke still works: only if the café had cream in stock, could it not serve it — the fact that they do have milk allows them to not serve that instead Brilliant. Maybe it’s me, but this joke tickles places in me a lot of jokes don’t reach. This joke has made me laugh again and again over the years, because jokes do that — they circulate. I look forward to hearing it again in a few years’ time, and enjoying it all over again. Blokes are like that with jokes, especially with Monty Python.
— Of course, it is even funnier when you DO know Sartre’s Being and Nothingness and the origin of negation
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davedevine 
2011-03-09 at 01:15
Wanted: Schrodinger’s cat – dead and alive.
-now THAT is a joke where you HAVE to know about Schrodinger’s cat or it just ain’t funny.
So I take your point. And yes, Python lives forever.