Don't want to be 'that guy' but the Holy Grail, and the melting of Nazi's faces are two separate Indiana Jones films. Holy Grail is the 3rd, the Last Crusade, and the 'melting of Nazi faces' is the first, Raiders of the Lost Ark.
you are completely right. As someone who loves those films i'm not just embarrassed, i'm mildly devastated. Please forgive me. I'm going to blame the thought of Meg's anus as the reason for my obvious blunder