The caption says, "Dilbert demonstrates the art of joke telling." Dilbert and Dogbert sit on chairs across from each other. Dilbert says, ". . . So the first guy orders a beer and a cactus . . ." The caption says, "A good joke teller will seek to establish a pattern." Dilbert continues, ". . . Then the second guy . . . Heh, heh . . . Orders a beer and a cactus . . ." The caption says, "Tomorrow's lesson: timing." Dilbert continues, ". . . So then the seventy-third guy comes in . . ." Dogbert is asleep.