One of my earliest movie memories is watching Raiders of the Lost Ark with my brother. Our favorite part of the movie came at the very end, when the bad guys opened the Ark and had their faces melted off (or, in the case of Belloq, blown off) by the power of God. I remember distinctly watching the exploding head over and over in slow motion (ah! the magic of the VCR) because my brother claimed you could see an eyeball fly off camera if you looked hard enough. Great movie. Yea, perhaps even one of the greatest ever made.
I also remember watching Indiana Jones and the Temple of Doom as a kid. My favorite part was the frozen monkey brains. Of course, Temple of Doom is no Raiders. Critics and fans alike have given it a lot of grief for not being Raiders. This is unfortunate. Temple of Doom deserves to be recognized as a great addition to the Indiana Jones saga. It also contains the best opening of Indiana Jones movie. Indy's fight at the Club Obi Wan is iconic.
Indiana Jones and the Last Crusade was my favorite movie for a long time. I can still repeat most of it from heart ("I don't like fast women!" "And I hate arrogant men!"). For most of my fourth grade year, I carried around a home-made Grail Diary in my pocket. While it has occasionally been criticized (not unjustly) for trying to be Raiders of the Lost Ark, Last Crusade brings a lot emotionally to the Indiana Jones table. We learn more about Indy's past, for example, and his troubled relationship with his father. We also learn that Indy's real name is Henry.