Welcome Back, Don't get Squished
One of my first days, I was taken down to the basement (staff only) stacks. It was my first encounter with rolling stacks, and I was told "Now, most of these stacks don't stay apart, so you want to get the book as quickly as possible, or brace yourself against each side as you get your books, so you don't get squished."
Hello! Heath and Safety? Not so much in this place. Just "Don't get squished." It's like a trip to the Death Star's trash compactor.
Good thing I'm young and spry.