I heard a first PHX-ATL this summer.

GA said, "if you are in Business Class, or if you are currently a Diamond Medallion, please raise your hand high in the air." Then she said, "if your hand is not in the air, please move away from the boarding door and let these people on the airplane. If you are blocking them, please move aside and let them through."

The funniest part was, as we were boarding F, watching people try to keep their hands in the air while pulling/carrying bags.

The only thing it actually made it helpful for was knowing who to say "excuse me" to as I was trying to make my way past them.