If I ever wanted to try to tackle another language, Mandarin would be a very attractive candidate, because Japanese uses Chinese characters in its writing system and Chinese loanwords, and I’ve long been fascinated with how they were adapted. I spent about a week looking into learning Chinese, and I spent the whole time thinking things like “Wow! “Chair” in Chinese is “isu” too?” (The characters are 椅子, and sometimes I see them used in Japanese too, but at the time I’d only seen “isu” written in hiragana: いす.) But I think Japanese will keep me busy until I die, so ^^;;