The classic prime joke (saw it originally in Sci Am back in the ... 70's? 80's?). Found an approximation when I googled it:
A mathematician, physicist, and engineer are taking a math test. One question asks "Are all odd numbers prime?"
The mathematician thinks, "3 is prime, 5 is prime, 7 is prime, 9 is not prime -- nope, not all odd numbers are prime."
The physicist thinks, "3 is prime, 5 is prime, 7 is prime, 9 ... experimental error, 11 is prime, 13 is prime, yes, they're all prime."
The engineer thinks, "3 is prime, 5 is prime, 7 is prime, 9 is prime, 11 is prime, ..."
A mathematician, physicist, and engineer are taking a math test. One question asks "Are all odd numbers prime?"
The mathematician thinks, "3 is prime, 5 is prime, 7 is prime, 9 is not prime -- nope, not all odd numbers are prime."
The physicist thinks, "3 is prime, 5 is prime, 7 is prime, 9 ... experimental error, 11 is prime, 13 is prime, yes, they're all prime."
The engineer thinks, "3 is prime, 5 is prime, 7 is prime, 9 is prime, 11 is prime, ..."