https://www.cracked.com/article_46582_rob-mcelhenney-reveals-the-inspiration-behind-franks-infamous-couch-scene-on-its-always-sunny-in-philadelphia.html

“I said, ‘Danny, I wanna show you a video,’ and it was a video of a giraffe being born, I wanna recreate this.’ And before I even hit play, he said, ‘No, I’ll do that.’”