“My happy wagon is almost empty, Leo. Only five pebbles left. Happywise, I’m operating on only 25 percent capacity. Remember when I first showed my wagon to you? How many pebbles were in it then? Seventeen? And then I put another in, remember? I never told you this, but before I went to bed that night, after we kissed for the first time on the sidewalk outside my house, I put in the last two pebbles. Twenty. Total happiness. For the first time ever. It stayed that way until I painted that big sign on a sheet and hung it outside the school for all the world to see…”