I found these on another web site. Here are the first 10 of 51.
Project Management Truisms
1. It takes one woman nine months to have a baby. It cannot be done in one month by impregnating nine women.
2. Nothing is impossible for the person who doesn't have to do it.
3. You can con a sucker into committing to an impossible deadline, but you cannot con him into meeting it.
4. At the heart of every large project is a small project trying to get out.
5. The more desperate the situation the more optimistic the situatee.
6. A problem shared is a buck passed.
7. A change freeze is like the abominable snowman: it is a myth and would melt anyway when heat is applied.
8. A user will tell you anything you ask, but nothing more.
9. Of several possible interpretations of a communication, the least convenient is the correct one.
10. What you don't know hurts you.