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, extra-large Jumbo Size Cat Litter Birthday Humor 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 big, colorful and hugely humorous birthday card. Suitable for all ages, and any cat aficionados.