The Simpsons (1989): Season 0, Episode 4

0 - 4: Babysitting Maggie

Marge puts Bart and Lisa in charge of babysitting Maggie. They watch TV while Maggie gets electrocuted, falls down the stairs, and falls off the roof. Maggie sticks a fork in an electrical socket thereby electocuting herself, she crawls up the stairs and falls down them in insane Slinky fashion then she climbs onto the roof in hot pursuit of a butterfly, and falls off it.