This is specifically for mechanical engineers.
There is a joke going around in Italy about the textbook ‘Elementary Mechanics’ written by Giovanni Gallavotti, one of the most eminent mathematical physicists of our time.
There is nothing ‘elementary’ in it, of course!
“A soldier goes off to trench warfare and is told that he can only take one book for reasons of space and practicality.
Being a physicist, he decides to take Gallavotti with him and slips it between his jacket and chest.
In a military action, while he was shooting from the trench, a bullet hits him in the chest but miraculously he is saved.
Moral of the story?
Not even a bullet gets through the third chapter of Gallavotti.”