The entire movie will be revealed as a hallucination of Dr. Jones, who is in a nursing home and in the grips of dementia.

I vote for them showing that internet video of Shia acting crazy, then the camera pans out to show it was Indy and a doctor looking through the cell window at a mental institution. Indy: “So, there’s no chance of a recovery?” “None at all. He’ll be here the rest of his life.”