Find Waldo, Yet Again is another book in the popular Waldo series. One page of the book features Waldo standing alone on an empty beach, which prompts Bart to remark, "He's just not trying anymore."
Waldo also seems to be a real person on the Simpsons, possibly even living in Springfield. In Bart's Comet, you can see him in the Flanders' bomb shelter at one angle, and on Hello Gutter, Hello Fadder he is seen walking past the Simpson's kitchen window while Homer is trying to find a picture of him on a cereal box.
Behind the laughter
Find Waldo, Yet Again is a parody of the Where's Waldo books.