"Fake" + "white" = too easy. Your joke about UWO here.

Girl #1: When I was 4 I had just grown in all of my baby teeth and a buddy I played with was pushing me in a stroller down the driveway really fast and when we hit the edge of the sidewalk I fell out and I lost my front four teeth. It was so bad I had to get braces when I was 8.
Girl #2: So those are fake teeth? They are so white.

-- Perth Hall bus stop, overheard by Sam