This is the subject of an entire book by Neil Postman called "Amusing Ourselves To Death" (1985), including a chapter called "Teaching as an Amusing Activity".
Some excerpts from the book:
> “Dr. Ruth Westheimer is a psychologist who has a popular radio program and a nightclub act in which she informs her audiences about sex in all of its infinite variety and in language once reserved for the bedroom and street corners. She is almost as entertaining as the Reverend Billy Graham, and has been quoted as saying, “I don’t start out to be funny. But if it comes out that way, I use it. If they call me an entertainer, I say that’s great. When a professor teaches with a sense of humor, people walk away remembering.” She did not say what they remember or of what use their remembering is. But she has a point: It’s great to be an entertainer. Indeed, in America God favors all those who possess both a talent and a format to amuse, whether they be preachers, athletes, entrepreneurs, politicians, teachers or journalists. In America, the least amusing people are its professional entertainers.”
...
> “We may surmise that the ninety million Americans who watch television every night also think so. But what I am claiming here is not that television is entertaining but that it has made entertainment itself the natural format for the representation of all experience. ... The problem is not that television presents us with entertaining subject matter but that all subject matter is presented as entertaining...”
...
> “Books, it would appear, have now become an audio-visual aid; the principal carrier of the content of education is the television show, and its principal claim for a preeminent place in the curriculum is that it is entertaining.”