1 Ginny: The zeppelin field is this way, I tell you.
2 Monty: How do we know you're telling the truth?
3 Ginny: Because there's a zeppelin landing over there?
4 Prof. Jones: She's right, Junior!
4 Monty: It's a trick, I tell you.

That would tend to be a bit of a give away. For most people.

The background is a photo of Shrewsbury, in Shropshire.

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2023-03-11 Rerun commentary: Looks like I flipped the background photo left-to-right for the third panel. Probably to fit the zeppelin in.

It's not often you need to fit a zeppelin somewhere.