>>51067852At Nick, the animators would have to sit around doing storyboards for hours upon hours on end. To blow off steam, they'd sometimes do joke storyboards they'd pass around the office that would almost always devolve into rape and gore if they went on long enough. Nick found out eventually and destroyed all of them except this page (it was buried in a stack of papers at the time, so the animator didn't even realize he still had it until a decade later). The context is that Angelica forced Tommy to get her some chocolate milk, so he put drain cleaner in it to poison her. The next several pages apparently turned into graphic Stu and Angelica porn.
These supposedly existed for nearly every show being animated at the time except The Wild Thornberries. There was a similar tradition where, whenever a show got shitcanned, the staff would write a joke script about how the show "actually ended". The only two we know about are Bye-Bye Beavers (they actually attempted to animate this one at one point) and the Pelswick one where Satan leads an army of demons to flood the Earth and slaughter all of the characters.