Apple for teacher? Why'd he do that?

[Indyologist]

First I want to say, IT'S GREAT TO BE BACK! I hope you've all had wonderful things happen in your lives while the Raven was closed. But now, the door is open again (it squeaks terribly, doesn't it? I'll have to let Marion know...), I have my drink in my hand, and my gun is nestled cosily in my handbag, not far from my reach should any Sherpas and their funny potholder-looking hats attempt to get cheeky.

Anyhoo, I'd like your comments. At the end of the classroom scene in Raiders, a perturbed looking student stalks past Indy and smacks an apple by his desk. Can you taste the sarcasm there, folks? Why do you think he did that? I'll tell my theory after you all tell me yours. I want to see how close I am in theory.

Thoughts? Explanations?