The Librarian was familiar with the meanders of his library, where the books were, the dangers of L-space wrapping dimensions. But what was life without adventure and books?
So he wasn't that surprised when a well stocked expedition to the most remote shelves pulled him to another plane
The lady orang-utan he encountered as he appeared was a lot more surprised. She froze in mid-gesture. The book she was shelving back fell off her hand. At least she didn't run shrieking "Eeeeek!".
The Librarian took a banana out of his bag and proffered it forward as a peace offering. "Oook!".