Teamwork is essential. It allows you to blame someone else. An expert is one who knows more and more about less and less until he knows absolutely everything about nothing. You can make something foolproof, but you can't make it damnfoolproof. Anyone who is popular is bound to be disliked.
Assumption is the mother of all screwups.
No real problem has a solution. Almost anything is easier to get into than to get out of. Authority tends to assign jobs to those least able to do them. Celibacy is not hereditary. The one friend or relative for whom you didn't buy a gift will arrive with one for you.