primary and secondary characters have at least one each. Notable expressions include Homer's annoyed grunt "D'oh!", Mr. Burns' "Excellent" and Nelson Muntz's "Ha-ha!" Some of Bart's catchphrases, such as "¡Ay, caramba!", "Don't have a cow, man!" and "Eat my shorts!" appeared on T-shirts in the show's early days. However, Bart rarely used the latter two phrases until after they became popular through the merchandising. The use of many of these catchphrases has declined in recent seasons. The episode "Bart Gets Famous" mocks catchphrase-based humor, as Bart achieves fame on the Krusty the Clown Show solely for saying "I didn't do it." Purported foreshadowing of actual events The Simpsons has gained notoriety for jokes that appeared to become reality. Perhaps the most famous example comes from the episode "Bart to the Future", which mentions billionaire Donald Trump having been President of the United States at one time and leaving the nation broke. The episode first aired in 2000, sixteen years before Trump (who at the time was exploring a presidential run) was elected. Another episode, "When You Dish Upon a Star", lampooned 20th Century Fox as a division of The Walt Disney Company. Nineteen years later, Disney purchased Fox. Other examples purported as The Simpsons predicting the future include the introduction of the Smartwatch, video chat services, autocorrection technology, Richard Branson's spaceflight, and Lady Gaga's acrobatic performance at the Super Bowl LI halftime show. Fact-checking sources such as Snopes have debunked many of these claims, saying that the show's extensive run means "a lot of jokes, and a lot of opportunities for coincidences to appear" and "most of these “predictions" have rather simple and mundane explanations". For example, the device shown on The Simpsons with autocorrection is an Apple Newton, a real 1993 device notorious for its poor handwriting recognition. Technologically advanced watches have appeared in numerous works of fiction, decades before The Simpsons. Influence and legacy Idioms A number of neologisms that originated on The Simpsons have entered popular vernacular. Mark Liberman, director of the Linguistic Data Consortium, remarked, "The Simpsons has apparently taken over from Shakespeare and the Bible as our culture's greatest source of idioms, catchphrases and sundry other textual allusions." The most famous catchphrase is Homer's annoyed grunt: "D'oh!" So ubiquitous is the expression that it is now listed in the Oxford English Dictionary, but without the apostrophe. Dan Castellaneta says he borrowed the phrase from James