The quote from Michael Lewis's "The Undoing Project" illustrates a humorous scenario where a man walks around with a banana in his ear for an absurd reason: to ward off alligators. This highlights the irrational ways people sometimes approach problems, clinging to ineffective solutions rather than acknowledging the reality of a situation.

The man’s logic is flawed since alligators are not present, which underscores the theme of irrationality in human behavior. It reflects how individuals can adopt peculiar beliefs or practices in an attempt to cope with fear or uncertainty, drawing attention to the complexities of decision-making and psychology that Lewis explores in his work.