Read the commentary from Cake Wrecks. It's a riot. As is the rest of the site, actually. It's a blog dedicated to cakes horrible in design and execution. It appeals to the same part of me that watches MST3K and still browses the late, lamented Inexplicable Object of the Week archive.
Some other highlights: a cake shaped like an insulin pen, delicious chest hair decorations, the Cake Head Diet Aid, and Inappropriate Much?.
In a similar vein, but from another site, I bring you the ANGRY GREEN VAGINA CAKE.
On the other hand, here is a totally awesome life size WALL·E cake!