Surely, a fun read:
I rigged up the inside of a basketball that I cut in half, with all the gear laid out inside and taped down, buttons up, and I had a girlfriend who’d strap this on under a puffy blouse and go in pretending to be pregnant! We had wires snaked up the arms to lavalier [clip-on] mikes on her shoulders, or on either side of a hat that I rigged up. She went to the bathroom, turned it on in the stall, walked back out to the front and we were taping! But then she had to stand, not sit, in the center of the stage all night, to get the stereo sound, and everyone kept asking her ‘When are you due?’ and saying ‘You can sit in my chair’ and all that stuff got recorded too. They were babbling into the microphones and ruining my tape.”
From the same site, also check out a comic entitled The Ballad of Frank Zappa as well as this interview with Wild Man Fischer (scroll down).