Why did you tear my boarding pass?

DXB – JED:  I approached Emirates boarding desk in Dubai Airport and presented my boarding pass. The lady took one glance at me, smiled and tore it up.  I was aghast.  Was about to question her … just then saw her punched a few keys into the computer, looked up at me and smiled.  “Sir, we’re upgrading you to Business Class”.  OMG.  I thanked her, smiled gleefully and proceeded to the departure lounge.  Thank you, Emirates.