The Simpsons - Season 23 Episode 12 -

After Moe is heckled for not having any real companions, Moe's best friend and beloved bar rag narrates his incredible thousand-year journey to Springfield. Beginning in the Middle Ages, the bar rag was loomed into a beautiful and ornate medieval tapestry and traveled around the globe through the hands of royalty before finding himself found himself at Moe's Tavern. Meanwhile, Bart begs Milhouse for forgiveness after the two friends get into a tiff, and when the bar rag goes missing, Moe realizes that he has more friends than he thought.