You will watch The Simpsons Episode 420 Whacking Day online for free episodes with high quality. Online episode guide, The Simpsons Episode 420 Whacking Day Whacking Day Bart is expelled from Springfield Elementary School, so Marge decides to home school him. Springfield’s annual holiday arrives: Whacking Day, a day specifically designed to drive snakes into the town’s square and club them to death. When most Springfielders celebrate the local holiday, Lisa is appalled at the upcoming celebration, but her protests fall on deaf ears. Lisa and Bart manage to convince the town about the nightmare of Whacking Day and Principal Skinner decides to allow Bart to return to school.