A catalog came to the house with this cool clock for sale:
The pins shift in and out as the minutes change, giving a cool bas relief* readout. It's like those pin art things where you stick your face in and the pins make a 3D mold of you. At least, I always stick my face in. Other people probably stick in other things. (keep your thoughts to yourself here, BP)
Any-hoo, the bottom of the description had this to say:
Takes 2D batteries
I laughed. Then, five short days later, I ran to the computer to share with you all.
I anxiously await the newest flood of spam postings in response.
*not sure if this technically is bas relief, but I didn't want to use 3D twice in two sentences.