The 'You Son of a Bitch, I'm In' meme originates from the Season 4 episode of Rick and Morty titled 'One Crew over the Crewcoo's Morty,' which aired in 2019. The episode parodies heist film tropes, specifically the cliché recruitment montage where a specialist is persuaded to join 'one last job.' In the scene, Morty (and later Rick) is recruited and responds with this exact enthusiastic phrase. It became an instant internet hit, used to express sudden and total commitment to a bad idea, a new investment, or a spontaneous plan. The template's popularity lies in its ability to highlight how easily humans can be convinced to do something ridiculous with the right pitch.