Ok, I might as well go first: I wish I could draw. Not at the level where I could make photorealistic portraits, but I’ve always been envious of those who are able to scetch something together in a few minutes that perfectly captures what they want to convey. Sometimes words aren’t enough to express what I want to say, and for those situations I would love to have a simple drawing do the talking for me.
Other than ALL, Spanish would be very useful. Japanese so I can watch Anime and not miss half of it because I’m reading subtitles. French so I can cuss at you and sound like I’m quoting a love song. German so I can quote you a love song and sound like I’m cussing at you. And Chinese (mandarin?) because that has a lot of business opportunity.