There's One, Only!

Sorry, it's all I've got for today.

A strange question

I was setting on my porch, when a young man walked up with a pad and pencil
in his hand. "What are you selling young man," I asked.

"I'm not selling anything," the young man said. "I'm the Census Taker."

"A what?" I asked.

"A Census Taker. We are trying to find out how many people are in the
United States."

"Well," I answered. "You're wasting your time with me, I haven't a clue."