I am a Garbage Truck has been fascinating J for several weeks now. It's also expanded his vocabulary to now include "hopper" and "hycleen truck".
J's always thrilled by the chore of taking the trash or recycling out. He races to the window when he hears the trash truck and typically asks about the possibility of seeing the trash truck every morning when I get him up and change his diaper. I guess it's typical boy stuff, but it is interesting that he has just sort of gravitated to some of this kind of stuff, without C or I pushing him.