Unshelved makes joke about items
Someone tagged Thursday’s Unshelved comic strip with frbr at Delicious. If you start at Monday’s strip you can see the whole week’s series, which are grounded in FRBR-based humour about the item entity.
(If the library has multiple copies of the book the woman wanted (multiple items of the same manifestation, probably), then why didn’t Dewey give one to her in the first place? Why say he’d reserve one if they were on the shelf?)