The passage suggests that the person reading may be an ordinary school teacher, yet the author playfully posits that she could perhaps be a witch. This idea invites children to look beyond the surface of people they know, appreciating both the mundane and the possible. The teacher’s smile may indicate a knowingness about the fun and absurdity of the idea, encouraging kids to embrace their imagination.

Roald Dahl emphasizes that while it is highly improbable for the teacher to be a witch, it isn't entirely out of the realm of possibility. This notion encourages readers to engage with the fantastical elements in the story, blurring the lines between reality and imagination. It sets a whimsical tone that permeates the narrative, prompting readers to consider the hidden mysteries around them.