What's a cow's favorite subject in school?

The joke “What’s a cow’s favorite subject in school? Cow-culus” is a play on words, merging ‘cow’, an animal known for its distinct “moo” sound and presence in agriculture, with ‘calculus’, a branch of mathematics. The humor arises from replacing the similar-sounding part of ‘calculus’ with ‘cow’, creating a whimsical and imaginary school subject for cows. This type of joke is known as a pun, where the funniness comes from the similarity in sound between ‘cow’ and the ‘cal’ in ‘calculus’, despite their entirely different meanings. Puns often involve a playful twist on words to create amusing or unexpected connections.