I typically walk BY to kindergarten every morning. He rides his balance bike, and I push the stroller (and wear a baby carrier). At certain parts of our walk, cars are allowed to park on the sidewalk. Since BY on his balance bike is narrower than me pushing a stroller, he can often pass cars on the sidewalk, while I am forced into the street.
A few days ago, there were a few cars in a row where this happened. As the first car separated us, we called a cheerful, "Goodbye!" followed by a "Hello!" a few seconds later as we emerged from next to the car. At the next car, we again wished each other goodbye and then, "Hello again!" I was about to respond with a terribly witty quote from Go Dog Go, but BY beat me to the punch: "Do you like my hat?" he asked.
We laughed and laughed. I am very proud.