The rule of three is a writing principle that suggests that a trio of entities such as events or characters is more humorous, satisfying, or effective than other numbers. The audience of this form of text is also thereby more likely to remember the information conveyed because having three entities combines both brevity and rhythm with having the smallest amount of information to create a pattern.

"The Three Little Pigs" is a fable about three pigs who build their houses of different materials. A Big Bad Wolf blows down the first two pigs' houses which are made of straw and sticks respectively, but is unable to destroy the third pig's house that is made of bricks. The printed versions of this fable date back to the 1840s, but the story is thought to be much older. The earliest version takes place in Dartmoor with three pixies and a fox before its best known version appears in English Fairy Tales by Joseph Jacobs in 1890, with Jacobs crediting James Halliwell-Phillipps as the source. In 1886, Halliwell-Phillipps had published his version of the story, in the fifth edition of his Nursery Rhymes of England, and it included, for the first time in print, the now-standard phrases "not by the hair of my chiny chin chin" and "I'll huff, and I'll puff, and I'll blow your house in".