Wow, this brings back some memories. I had something similar happen to me the first time I got really, really high. It was the first time I had ever bought a bag of my own and I went out to the woods next to my house and smoked a joint and two bowls by myself. As I was walking back to my house it seemed like my eyes were moving back and forth. It made getting out of the woods a bitch and I actually ended up walking into a tree. That was 23 years ago and its never happened again. I had never heard of anyone else having this either and thought maybe I had imagined it until you brought it up.