So many, but the big one for me has to be....
Indiana Jones ends with Last Crusade for me. Three classic adventure films with awesome main characters fighting Nazis and natives. It ended, decades ago, there was no need for more, resolution was there, trilogy complete. I even accepted Young Indy as okay aside, but that...thing Lucas came out with was so so bad and awkward and unnecessary. Even when it felt like old Indy it just highlighted how wrong and...just, no sir, no, stop it, swinging with vines with monkeys, aliens? That's my childhood you're raping, cut it out!