Another Fine Line

This can be taken so far as to advise people to present only what they know. But sometimes, you also have to think if that's appropriate, or, to be more in line with the theme, you have to either study up on something completely new to you, or to pass off the work to someone who would be able to give the presentation more justice.

Like, for example, plucking an analogy out of the blue, a person being asked to teach logic but, since trivia is more their specialty, that's what they talk about in class.