I pulled up next to a Gen 3 Sandy Beach, gave a quick honk and wave then pulled into Best Buy. The other Prius happened to pull in as well. He got out and asked if I knew him, I replied "no, you're driving a Gen 3 Sandy Beach Prius" I said with a slight grin, his response was "OH" and walked away. In another instance, a different Gen 3 Sandy Beach arrived at a 4 way stop, when he turned left (passing me) he gave a smile and wave. When I had a New Beetle, everyone gave the NB wave, I guess it isn't the same with all Prius drivers.