I found this pretty odd. The book in my set disappears into the slot and I had to flip the box over and use a putty knife to get it back out. I made a sling out of duct tape to keep the book from disappearing again.
I would say that this is a contender for one of the oddest:
Bill Evans, Verve box.
It's designed to rust on purpose, and owners have reported getting cuts on their hands.
Bookmarks