These are a few of his favorite things...see if you find a bit of a theme

Trucks and Buses

Books...especially his book about Trucks and Buses.

"Talking" on the phone

Vacuuming

Trains!

Chewing on inedible objects

Dogs...particularly Nanny K's puffball named Spike. 

(although, he actually seems convinced Spike is really a cat instead of a dog.)

Garbage trucks!!!!