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!
Smoke Gets in Your Eyes by Caitlin Doughty - it’s a really interesting and very funny book about the funeral business. It’s very frank, she’s very forthcoming, it’s very well worth reading.