I can give some instructions on how to properly wave to other Subaru “enthusiasts”:

Step One.) Lower your window.

Step Two.) Move your hand out so it’s clearly visible.

Step Three.) Make a fist with your hand.

Step Four.) Extend your middle finger so the fellow enthusiast can clearly see your enthusiasm for their ownership of a Subaru vehicle

Step Five.) Take a drink from your monster energy drink.

Step Six.) Crash into a wall.