First, he had a piece of tubing from Mom's nebulizer, and was using it as a hose for his firetruck. He found it very amusing to pretend spray Daddy, while Daddy would sputter and shield his face.
Later, he picked up a carrying case for his blocks, waved, and said "Bye!" I suspected he was mimicking Daddy and his laptop bag, and I asked, "Are you going to work?" to which he replied "Yeah!" Then he set his case on Daddy's desk chair and climbed up after it. He spun sideways and used the arm of the chair as a steering wheel.
So this is how role-playing begins. I'm a proud papa.