For me for example its “Eat me - a natural and unnatural history of cannibalism” by Bill Schutt. Its an amazing book that covers cannibalism in animals and then the history of it in humans (cultural, survival & medicinal cannibalism).
I got a lot of “oh why would someone read something like that?” And “that not something fun to read about!” From relatives but my friends enjoyed the stuff that I could tell them about cannibalism!
I finished reading it not too long ago. It is a good read-- very well-researched and written. My one (subjective, personal) gripe with it is that it kinds of drags in the middle as it is quite a long book. I think the book would have been just as informative and a ton more engaging if it was a little more concise. I would still recommend it though for anyone interested in the medical history of cancer.