The other day, the Pumpkin Daycare had its annual field day.
There are two Chinese families in the Pumpkin Princess's class (a pair of twin girls and a boy). I was talking to the boy's mom, and the twins' mom showed up and they started chattering away in Mandarin Chinese. I picked up exactly two words, "Nihao" (hello) and "arzi" (son).
So since the average Japanese person would probably only have picked up "Nihao," it's safe to say that my Mandarin Chinese is twice as good as most people, right?