Don't ask Joker about penguins. He doesn't live so far up north for a reason.

....The main reason is that it's cold enough to freeze his anus shut, but, listen. Penguins are a good reason to.

"Well, as it turns out, I'm a tad stuck ta the bottom of the water, so I think that suits us both nicely~." After all, that means they have something unique to offer to one another. Isn't that how the best trade starts up? "Is it just fish that yer lookin' for, then?"