Yes, I think that should be a category.
I borrow books from the library. People use bookmarks in books. Some of these bookmarks are whatever these strangers happen to have around them that’s flat. I’ve already seen the grocery lists and library slips. And people are strange. You know where this is going. Today I opened up a comic book (yes, I read one once in a while) and found… This.

If anyone can figure out what ties all these together….