I'll try to talk to him tonight.
For now, I was working on this a bit more, created the first few states, minus the duck himself,
here's a video.
Basically, regular circus music will be playing at the beginning, then you jump on the ferris wheel and it takes you up (you can't move at this time). Once you get up, you see the duck in a gondola or on a platform or whatever, and he has an over sized switch with him. After you stop, he does a little pose as the boss music starts (with some kind of orchestral hit thing? Whatever) then he flips the switch and the battle begins (I think it would be funny if he has to put his entire weight into the switch to flip it). During the battle, he'll randomly choose an attack to do, I seriously have no idea what those attacks may be, except maybe trying to drop a bomb on you, and one of them will be him changing the direction of the wheel, presumably faster and faster as you hurt him. While I'm on the subject, I still have no idea how you will hurt him, maybe some kind of platform shows up and you can jump on it? Maybe that's part of an attack, I dunno, open to ideas.