It's a mark of mental deficiency to say so little and laugh so much at things that aren't funny.  But that's Don.  Here, Don.  Look!  I'm holding up two fingers.  Don laughs.  Look, Don, I'm raising my leg.  Don laughs.  He must be a barrel of laughs --- just laughs --- at a dinner party.  His friends just sigh and say to themselves, "Oh, dear DonInKansas, if you could just talk to us and show us what's inside.  We try so hard to reach you.  We know someone's in there.  But all you give us is that vacant laugh.  Poor Don."  And then, one day, Don started posting on NCR.