In the scene, a person is claiming that they think it may rain tomorrow because of the grey clouds coming in. Instinctively, the next person goes and knocks on the base of the tree as if they were to say “knock on wood”. This myth is the idea that if something potentially negative is said or something is said that you do not want to happen, knocking on the wood would cancel out that thought and there will be, for example, a lesser chance of rain.
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It’s interesting how the comic treats knocking on wood as a small, instinctive ritual to cancel out a negative thought—like the grey clouds and the wish to avoid rain. The scene is simple, but it captures how superstition often works best without explanation: one person says something unwanted, the other reacts automatically. The myth itself isn’t really about rain at all, but about trying to undo a thought we don’t want to come true.