Amazon's rabbit hole
Start with this book on Amazon, then explore the similar books (there are two lists on every page). Try to guess which books are completely serious, actually existing books. It's like a weird parallel world. Cheese Problems Solved? What connects a book about huge ships to The Big Book of Lebian Horse Stories? It's like a little ARG. Or is it?Don't ask how I found that book. That page was just open on my computer one day.