Oh man! I have a Subaru sign/wave! I've been doing it for months now and it never seems to catch on (well, I never get one back...).
It's the "solid" fist! You know, an "s" in American Sign Language!
I means "solid" and "Subaru"...at the same time.
It looks like this...
You just put it up in the air when you see a Sube. Well, with all the Subes in my area, I've kind of narrowed it to Subes of the same body style as whatever I'm driving (if I'm in the EA81, I wave at EA81s, etc.).
I think everyone should do it!
Just raise your right hand and make a fist whenever you pass another Subaru.