At Long Last Leave marked the 500th episode of The Simpsons. Whether or not you were still into the show when it touched upon this incredible milestone matters not - this episode is made inarguably important on account of its existence alone. Thankfully, it's actually a pretty good installment in general - one that sees the family thrown out of Springfield after the town become sick and tired of them (a knowing meta-comment, perhaps?). This episode is also notable for the guest appearance of Wikileaks creator Julian Assange, who they discover is hiding out in a place called "The Outlands." Plot aside, though, perhaps the best thing about At Long Last Leave is its opening couch gag, a brilliant dose of nostalgic awesomeness made up of previous couch gags from across the years. 500 episodes of anything is a great and notable accomplishment, and though - at the time that At Long Last Leave aired back in 2012 - the show was considered (and still is) to be twiddling its thumbs somewhat, there's no denying the importance of The Simpsons - an animated TV show about a loveable, dysfunctional family - cementing its place in history.