Hilarious jab at Perth drivers on plane from Sydney

I have lived in Perth for 5 years and was in Sydney for 3 days last week. On the flight back Sunday evening, just before landing, the captain starts making the regular announcement about ETA, weather, etc, and finishes by saying something along the lines of : "If you are visiting, we hope you enjoy your stay. If you are coming home, please learn how to merge". The laughter that immediately erupted inside the plane was almost as funny as the announcement itself.