Books that your DCs find inexplicably hilarious

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5 year old DD completely dissolves into giggles every time I read her "The Day the Crayons Quit". Like, can't breathe level of laughing. It is her favourite book so it doesn't change with repetition.

I can't figure out what is so funny. I don't even really do voices.

Anyone else had a similar experience with books and DCs?

Ds was in stitches over parts of Cue for Treason last year. I remember some of it being a bit amusing ..

Witchend.

I wish I knew the secret. Might make bedtime rather more fun.