Photoshop can easily become Phot-Oh-S**T!, as the editors at Marie Claire discovered recently.
Sharp-eyed Gordon Pritchard noticed this aberration (see photo) on the magazine's June cover.
His excellent Quality in Print blog normally deals with the finer points of prepress and printing, demonstrated with fabulous graphics. He even makes the concept of screen angles easy to understand.
But Gordo's not all business. Check out his hilarious summary of real-world magazine workflow in the context of the Marie Claire goof.
UPDATE: There's been a lot of debate on various sites about whether this is really a Photoshop mistake or just a huge cube ring on Beyonce's finger. See Gordo's new take on the image and on Photoshop disasters in general. And for more fun go right to the source, Photoshop Disasters.