Two penguins look incredulously at a third penguin pal wearing a casual Hawaiian shirt. He sheepishly responds to their stares saying he thought it was casual Friday. Caption reads: You're kidding. I thought it was Friday.

• New Yorker Cover by Artist Leo Cullum, originally published on May 18th, 1998
• 15oz. Porcelain Jumbo Mug
• Dishwasher and microwave safe
• Size: 5"x4.25"