T-Shirt Poll

Phade's Day made me start thinking about making T-shirts. I think his list should definitely be a tee, but also one on the topic of "cake-ponies." (reference: Client/patron/whomever requests something that is essentially impossible to do- or at least very unrealistic. They are basically asking for that 17th century book to be checked out to them... and have a pony, too. Have their cake and eat it too. Cake-pony)
I want to put together a t-shirt that says something like: "Cake-ponies not included" (a la "batteries not included). But it also needs a logo.
So! In comments, please feel free to riff on my tag-line and if you have any picture ideas, let me know.