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.