Ha! My son does a similar icebreaking thing with folks of different culture/language. He asks them how to say "Excuse me, your dog is on fire!" Has it in 5 or six languages now.
Growing up in the US, I learned Finnish from books and maybe some official radio/TV, as well as family. My cousins in Finland made fun of me for speaking like a book: I'd always choose the first sentence you presented and they'd just gawk. "Who talks like that?"
I knew lots of old words they'd never heard, though, since I was practiced at speaking with 70-year-olds who'd learned from their immigrant parents. A little linguistic time warp...
What the others pointed out, sorry for not linking directly. I was on iPad and searching on a separate tab, copying and all the hassle was slightly too cumbersome... And you may have already seen it :)
