I have my own opinion on that, and I KNOW I have told this story on this board before, many years ago, hehe......
I was at Oswego (with my buddy Geoff who I am going to the Gorge with in a couple weeks), and after the second day, we were unwinding in The Green listening to a DJ. I was stretched out on the grass when I said to Geoff "Hey man that guy beside us sure looks a lot like Fishman". Geoff looked over and said "man....that IS Fishman!".
So that was fine, we amused ourselves for a little while by watching him smoke some doobies with a few girls, and seeing people just walking by realize it was him.
After a little while of this, the DJ, who was doing Skratch Bastid type classic rock mixes, started playing, you guessed it, Misty Mountain Hop. I immediately sprang up and started rocking the fuck out. I look over beside me and Fishman is doing the same thing, playing air drums and losing his shit!
It is my opinion that after that he went back to the boys and said "hey fellas, you know what we should do......."
Thats my story and I'm sticking to it.