A running joke that has been running on for far too long. Every profession has a different proof that all odd numbers are prime (and yes, we assume that 1 is prime, even though 1 is not prime):

Mathematicians:
"1 is prime, 3 is prime, 5 is prime, 7 is prime; the proof follows by induction"
Physicists:
"1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is experimental error, 11 is prime, 13 is prime, 15 is experimental error, 17 is prime, 19 is prime; the empirical evidence is overwhelming."
Engineers:
"1 is odd, 3 is odd, 5 is odd, 7 is odd, 9 is odd, 11 is odd, 13 is odd, 15 is odd, 17 is odd, 19 is odd, ..., 111 is odd, ..."
Psychologists:
"1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is latently prime but repressing it, 11 is prime, ..."
Computer scientists:
"1 is prime, 3 is prime, 5 is prime, 7 is prime, 7 is prime, 7 is prime, 7 is prime, 7 is ..."
Damn you ariels, damn you to all eternity!!

I created this nodeshell upon remembering the joke, wishing to fill it after I finished my "research" - the research involving calling up the friends who were there when this joke was told for the hundredth time, and everyone put in their 2 cents worth. And ariels comes and beats me to it. So I shall just add the less obvious ones:

Economist:
Assume 9 is prime...

Pentium user:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 8.999983 is prime...

Unix user:
1 is prime, 3 is prime, 5 is prime, 7 is prime, ... Segmentation fault, Core dumped.

ZX-81 user:
1 is prime, 3 is prime, Out Of Memory.

Undergraduate:
Let p be any prime number larger than 2. Then p is not divisible by 2, so p is odd. QED

English major:
What's a prime number?

Athletic scholarship:
What's a number ?

Statistician:
Let us take a sample of odd numbers: 7, 13, 29, 37, 53 and 71 are prime. They are all prime, so all odd numbers must be prime.

And yet, still more!

Mac users:
1 is prime, 3 is prime, Look at the pretty picture!

Windows Vista users:
1 is prime, 3 is prime, 5 is prime, 7 is prime, The number 9 is trying to be prime. Allow, or deny?

Australians:
Prime? You mean Kevin Rudd?

Gamers:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is only prime after completing the game and unlocking everything.

LOLcats:
1 iz prime, 3 iz prime, I iz hungry. I needz a cheezburger.

Couch potato:
If the TV says it, it's true. So all odd numbers are prime.

Everythingian:
Your node 9 is not prime got downvoted to -9, so it got nuked.

Thanks gate!

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