I thought it was a random hippie in the audience taken from a live show lol cause their studio shit back then was more like a mix of live and studio stuff. Sure sounds like I do sometimes lmao...
Yeah its for sure Bob He does it in the live version they did on Playboy After Dark. https://www.youtube.com/watch?v=qsL3X6ARgVI They seem to have cut a verse but i love the scream. Such a sweet performance