Joker tries his best not to cackle much, because it is late at night and he does have some sense of decorum about other people.

“Now when did that happen!
I couldn’t imagine~.”

Still, he has wondered about what Zecora’s brews and magics could do for that particular problem. It’s something he’s shyed away from, he has to admit, just because of, well. Personal problems regarding his right arm and any replacements for it. That’s a question to ponder for another day- something he always tells himself as he puts it off.