The other night, Miles and I crossed the field that seperates my in-laws home from ours. I noticed one of the cows was eating and told Miles to say 'hello to the cow.'
"Bull," he responded.
"Ok," I said, "say 'hello' to the bull."
"Hello," greeted Miles.
"Say it loud, like a cow," I encouraged.
"Moooooo!" yelled my son.
I'm sure I learned from that exchange than he did.