Blizzard: “Thanks for logging in during the anniversary.  Here’s an achievement and a pet.”

SE: “Thanks for logging in during the anniversary.  Here’s a quest to start a maze-mini dungeon that totally breaks the fourth wall and makes fun of ARR’s launch.  It only takes a few minutes out of your day, but you get to meet YoshiP’s avatar who thanks you for your time and hopes you continue to play.  And here’s two mini pets.  And a music scroll.  And an achievement!  Thanks for playing!”