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It's Flu season, and Marge will make sure her kids get their shots... one way or another.
Bart and Lisa head out with Marge thinking that they're going to Free Candy Day, but it's revealed to be a trick as she's taking them to Dr. Hibbert for flu shots. After a long wait in line for their excruciating torture, Bart asks Lisa for a hug of support only to switch places with Lisa at the last second. Lisa gets the last flu shot that Hibbert has and Bart celebrates his good fortune...
... only to later end up getting the Flu when it really is Free Candy Day.