Get ready for a whirlwind tour through cinema with a twist, where one letter can turn a blockbuster into a belly laugh. In this listicle, we present 20 classic movie titles that have been hilariously altered by changing just a single letter, resulting in titles that promise a very different viewing experience. Imagine stepping into a world where "Sad Max" roams a dystopia filled with melancholy, or where "Lord of the Wings" explores the epic journey of Frodo eating lunch. Each altered title is…