Pretty much every social instinct I employ comes from George Costanza of Seinfeld fame. (... and yes, the fact that it's been 11-plus years since the Seinfeld finale means I officially have to remind people who George Costanza was.)*"Whatever your instincts tell you to do, do the opposite.""It's not a lie, if you believe it."But my favorite Costanza-ism of all time is George's parting shot in any relationship on which he has soured ... "It's not you, it's me." You see, despite the fact