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How different people prove that   all odd integers are prime numbers

 
Mathematician: 1 - prime, 3 - prime, 5 - prime, further by induction. 
Physicist: 1 - prime, 3 - prime, 5 - prime, 7 - prime, 9 - uhm.. measurement error, 11 - prime, 13 - prime, ...
Engineer: 1 - prime, 3 - prime, 5 - prime, 7 - prime, 9 - prime, 11 - prime, 13 - prime, ... 
Astronomer: 1 - prime, 3 - prime, 5 - prime... hey, let's publish this quickly!
Professor: 1 - prime, 3 - prime, 5 - prime,   the rest is left as an exercise for the students. 
Undergraduate student (reading the output of his/her C++ program): 1 - prime, 1 - prime, 1 - prime, 1 - prime, 1 - prime, 1 - prime, ... 
Graduate student (reading the output of his/her Fortran 90 code): 1 - prime,  3 - prime,  5 - prime, 7 - prime,   *** TERMINATING a.out   *** Received signal 11 SIGSEGV   Segmentation fault.
A theologian: 3 is prime (and that's good enough for me!)
Ekspert zespolu Macierewicza: 1 - liczba pierwsza, 3 - liczba pierwsza, 5 - liczba pierwsza, 7 - liczba pierwsza, 9..... !!! NIE JEST LICZBA PIERWSZA, co z zgodnie z prawami matematyki dowodzi, ze byl ZAMACH.