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!
The End of Everything (Astrophysically Speaking) by Katie Mack. It’s a book exploring how the universe might end, which sounds unbelievably bleak, but it’s written with such a playful sense of humour and an obvious love of cosmology, using the lens of endings to dig into questions of how our universe ticks.