After Marge convinces Homer to stop drinking for a month, Homer goes insane and realizes how he heavily he relies on beer to brighten up his life.
Duffless seems a little less funny when you read the description but trust me, it is a very good episode. It is often left out of Simpsons fans' lists of favorite episodes, wich I find curious because this episode is fantastic. It has a great plot, a few laugh out loud moments, and overall great writing. My favorite moments would have to be Homer on a bike, Homer at the Duff brewery, and a few other great moments. Oh, I almost forgot. There is a not as funny side plot about Lisa where she swears revenge on Bart for ruining her project. All though this side plot was not as good as the main plot, I loved the Clockwork Orange parody. So, overall, great episode that really is underappreciated.