Lesson 2: Learn when to keep your mouth shut.

I suppose this is nothing new. But there really are certain times when you get fed a load of shit just by simply opening your mouth at the wrong time. John Mayer's My Stupid Mouth just about captures the thought to a tee.

Or perhaps a more familiar scenario: keeping quiet about something and someone because of mutual shame. An old PMT rule immediately comes to mind: What you see, what you hear, when you leave, leave it here.