An old man was accounting manager in a company.
Every day when he was coming to office, at his desk, he was opening the drawer,
seeing something in it very carefully, then he was closing the drawer back.
After twenty years of work at the same position, one day he died.
After his funeral, his colleagues came to his office to check out what was in his drawer,
they opened the drawer, in a piece of paper very bold it was written “Debit Left, Credit Right”