The best "I told you so" is the silent kind. An "I told you so" is always preceded by a challenge to your authority. The other person should have had reason to

The best "I told you so" is the silent kind. An "I told you so" is always preceded by a challenge to your authority. The other person should have had reason to believe that you knew what you were talking about, but they foolishly ignored you. But saying those words turns YOU into the jerk. It's much, much better to have other people around you judge the situation for themselves and make the determination that you were right. Even if nobody actually says that you were right and they were wrong, in a healthy organization your respective track records will be noted.