You ought to see the size of a Morley Rotating Wah pedal. It's the size of a Volkswagen and it's chrome. It's one of the most outrageous pedals ever made, but finding a working one is pretty tough. I currently have three of 'em with the intent to build one that works perfectly out of all of 'em. If I can get all three working properly, it's a bonus. They work as a volume pedal until you want them to work as a wah. Then there's another button that turns on the oil can, and it does a completely outrageous warbly echo/chorus/delay kind of thing. Do the wah and the oil can at the same time, and it's something you can't get any other way.
I thought it would sound great with a bowed upright. It sounded awful. Not all great ideas turn out to be good ideas.