Never trust a white man,
Never kill a Jew,
Never sign a contract,
Never rent a pew.
Don't enlist in armies;
Nor marry many wives;
Never write for magazines;
Never scratch your hives.
Always put paper on the seat,
Don't believe in wars,
Keep yourself both clean and neat,
Never marry whores.
Never pay a blackmailer,
Never go to law,
Never trust a publisher,
Or you'll sleep on straw.
All your friends will leave you
All your friends will die
So lead a clean and wholesome life
And join them in the sky.

Ernest Hemingway

http://www.poemhunter.com/poem/advice-to-a-son/