The Scorpion's Tale
The Simpsons Season 22 Episode 15 (03/06/11)
Lisa discovers a flower that makes aggressive creatures get along; Grampa is forced to come live with The Simpsons when he gets kicked out of the Retirement home. Homer ends up using Lisa's flower to calm down Grampa and it catches the eyes of a pharmaceutical executive (Werner Herzog). Soon the whole town of old people are on the pill until they discover its side effects: your eye balls pop out.