An episode of "The Simpsons" is dedicated to Moe Szyslak's bar rag.

True. In the episode titled "Moe Baby Blues" from the thirteenth season of The Simpsons, Moe Szyslak's beloved bar rag is featured as a central plot point. The rag is accidentally used by Marge to clean up a mess at home, leading Moe to be heartbroken and depressed over its loss. The episode revolves around Moe trying to cope with the absence of his treasured rag and eventually finding a new purpose in life by adopting three orphaned children. The dedication of an entire episode to Moe Szyslak's bar rag emphasizes the significance and sentimental value that Moe places on even the simplest aspects of his life, showcasing his deep attachment to his bar and the objects within it.