Explain the irony in the cartoon.

The cartoon displays situational irony.
The good news that Hammie expects to find turns out to be Wren tearing his library book into shreds.
The Irony in this cartoon is the girl is being sarcastic. So with that sarcasm she is expressing how the baby ripped up the book, but instead she is saying that the baby found the book. So the girl meant something else but means something completely different.
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