The screaming on Part 2 is actually the voice of Yoshimi. When producer Dave Fridmann heard the sounds, he told Wayne, "You know, it sounds like Yoshimi is either being killed by or having sex with the robot."
That observation ended up shaping the entire album. Wayne told Red Bull Music Academy
: "That's the way that the track was sounding, and then I think I said something like, 'Yeah, I think it would be a pink robot,' and all of us kind of went, 'It could be. That really could be a title of this record that we're making, Yoshimi Battles the Pink Robots
,' because we knew Yoshimi was a real person. It wasn't an abstract, made-up character, it's just a person, and we knew this idea of the pink robots was a very Flaming Lips thing, that it's a robot but it's pink and it's soft. It would have a lot of entities that the Flaming Lips would think are important but nobody else would. It spurred us into making the next three or four songs that we knew were intended to be on the record called Yoshimi Battles the Pink Robots