The Simpsons: Numbered Doors
Math → Numeric Systems → Roman Numerals
Bart is running away from a group of kids from the neighboring town, Shelbyville. He enters a tiger feeding area and needs to exit through door number 7 to escape; otherwise, he'll encounter a man-eating tiger. However, the doors are labeled in roman numerals, and he doesn't know roman numerals. He uses his knowledge of Rocky movies to figure out the correct door to open.