The complete list of words that David Foster Wallace circled in his American Heritage Dictionary

"Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo." is a grammatically valid sentence used as an example of how homonyms and homophones can be used to create complicated constructs.

The Simpsons television series has used many interesting words and phrases over the years, the most famous of which is Homer's saying: "D'oh!", which is referred to in scripts, as well as several episode names, as "annoyed grunt".