Even the most beloved TV shows of all time make mistakes. It could have been a terrible finale that practically negated what came before it, a dud of a plot twist, or an unnecessary "WTF" arc that had no business being a part of the greatness that surrounded it. It happened to the best of 'em.

Brace yourselves, TV fans. Here are seven episodes that (almost) effed up the legacy of our favorite shows forever. We'll forgive them... but we'll never forget.