We all know cats are pretty smart. But, apparently, when properly motivated, they can be downright ingenious enough to spell! No shit! Okay, yes, with shit - as depicted on the rather dirty Cat Litter Birthday Joke Card from NobleWorks. A frustrated furry feline truculently and turdily spells out 'Clean My Litter Box!' in no uncertain brown terms in its green litter box on this colorful and humorous birthday card. Suitable for all ages, and any cat aficionados.