From Zappa Wiki Jawaka
Another regular was a guy we called 'Louie the Turkey' - because of his laugh. His real name was Louis Cuneo. He wound up on the Lumpy Gravy album as one of the people talking about incomprehensible stuff, inside a piano.
We would always know when Louie was in the theater because we could hear him in the back of the room. I would invite him onstage, give him a stool to sit on, hand him the microphone and stop the music. He would sit there and laugh - at nothing - and the whole audience would laugh with him for five minutes. Then we thanked him, and he'd leave.
Cuneo's laugh can be heard on White Ugliness.