Spend a few minutes perusing a list of IMDb’s top-rated Friends episodes and you’ll probably pick up on certain trends. Of all 236 chapters of the decade-long Friends saga, that one (season 4, episode 21) has the worst rating on IMDb: 7.2 out of 10 stars, with nearly 4000 reviews. As for why Ross and Rachel’s season 4 walk down memory lane failed to reach even that level? The highest-rated Friends clip show, “The One Where Chandler Gets Caught,” is a season 10 episode in which Monica and Chandler are preparing to leave Manhattan, and the friends reminisce about all their years living together in the city. But just because “The One With the Invitation” is currently the lowest-rated Friends episode doesn’t mean it has to stay that way forever.