Looking at the extra spoiler pictures of Henry driving, he clearly isn’t getting a lesson from David. There’s a shot of David jumping into the car with Henry already driving, so I think Henry took it on his own initiative to try to drive for some reason, and David is trying to get him to safely stop the car. They run over a mailbox, almost into another car and not sure what else.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass