Designer David Pier believes he's put together the ultimate coffee cup, which he describes as:
The ultimate in ergonomic modern design. A unique and innovative cup that is as delightful to the hand as it is to the eye. Usually, original designs are different just to be different and therefore can be awkward to use, but this mug was designed to be superior in its function. Every convention was challenged during the design process; new techniques were even developed to accurately manufacture the unusual shape. Just as no time or effort was spared in the design, only the finest porcelain was used in the manufacture.
You can get them for $22 each here, though it's not nearly as ultimate as the designer would have you believe. I asked mine to pick up some groceries and all it did was crash my car into a tree. Ultimate my ass!