One of my favourite acknowledgements in a book is from "Proofs: A long-form mathematics textbook" by Jay Cummings[1]. Which as it sounds like is a maths textbook. Anyhow the acknowledgement reads:

   "To my loving wife,
   who read this entire book,
   apart from the math parts."

[1] Which in my opinion is an excellent book if you want to learn how to read and do maths proofs btw.