I heard a couple of engineer jokes recently:
An engineer, a physicist and a mathematician are all staying in hotel rooms when simultaneously fires break out in all three rooms.
The Engineer wakes up, goes to the bathroom, douses the flames liberally and procedes to soak the entire room with water once the flames go out and goes back to sleep.
The physicist gets up, calculates quickly at the table, goes to the bathroom, gets 15.6 liters of water and puts out the flames precisely, and goes back to sleep.
The mathematician gets up, calculates furiously at the table, goes to the bathroom, lights a match and extinguishes it in the sink and shouts "Ah ha, there is a solution." And then goes back to sleep.
And the other:
A Mathematician, a Physicist and an Engineer all have to verify a theorem, which states "All odd numbers greater than 1 are prime numbers."
The mathematician says, "3 is prime, 5 is prime, 7 is prime, 9 is not prime. Thus the theorem is incorrect."
The physicist says, "3 is prime, 5 is prime, 7 is prime, 9 is not prime... experimental error."
And the engineer says, "3 is prime, 5 is prime, 7 is prime, 9 is prime..."