This looked fun.
Also, if a book is randomly lying in the mail station of an apartment complex and no one is around, can you assume that the book has been abandoned and take it and give it a good home? How about if you come back 5 hours later and the book is still there? I didn't take it, but I sincerely wanted to. I did pick it up, but then a Fall 2006 syllabus fell out of it. Clearly someone is using it this semester. Even if they dropped the class, at this point, they could still return it. I could think of no reason why a person would have left it there, but neither could I work up the courage to take it. The book in question: