April 1st means April Fools’ Day pranks, and libraries are enthusiastic participants sharing whimsey via their websites, Facebook, and other social media. ALA rounds up their favorite lighthearted library pranks and hoaxes each year at American Libraries magazine's April Fools' Day Archives, where you'll find gems like these:

"We are very excited to add an invisibility cloak to our Library of Things collection! This is an incredible opportunity for the community of Hillsboro to try out cutting-edge technology, so be sure get your hold request in soon. You can find it in the catalog here: http://ow.ly/XDwO30jfGkm." [Hillsboro Public Library, 2018]

"Brookfield (Conn.) Library and Sewickley (Pa.) Public Library hosted April Fools’ cupcake decorating programs for teens. Fortunately, both programs made cupcakes that looked like mashed potatoes, popcorn, or peas and carrots, rather than tasted like them." [2012]

Sacramento (Calif.) Public Library announced that their Library of Things had evolved into a new Library of Cats, with apparently a lengthy borrowing period: “Patrons can now borrow a kitten and return a cat.” [2015]

Ride-along-reader. "Enjoy this new Library service launching April 1." [Sacramento Public Library, 2018]

Here's a bonus I found at Oakfield Public Library's Facebook page via the Cheshire Public Library: Gullible's Travels

Image credits:
• Coffee Banned from Library Premises, Kennedy Library via Flickr, Creative Commons license Attribution-NonCommercial 2.0 Generic
• Ride-along-reader, Sacramento Public Library via Facebook