How does this thing work again?

Imagine, if you will, that the wagon was standing upright when this exercise began. 

It all started out fairly normally--Cash was pushing along, then he hit the wall (literally). When Momma didn't rush over to turn him around, he decided to explore new wagon fun. 

First his head went under the handle. He stood there like that for a while and didn't make a peep. I suppose he was trying to figure out why he couldn't stand back up. Next went his right arm and shoulder. Again, he stayed like that for a short while, wondering what to do next. Finally, his left arm went through and things (to Cash) seemed to make sense again.