Leading questions

A conversation from today:

"Dad, what happens if something falls into the heat vent?"

"Why do you ask?"

"No reason. Just interested."

"Well, it depends on what it is."

"So if it is something bad, what might happen?"

"You mean the whole house explode or something?"

"Yes"

"Again, it depends. Is it likely to catch fire?"

"I don't think so but maybe."

"What was it?"

"Umm, it might have been a Lego."

"Do you mean one of the Star Wars legos?"

"Maybe."

"Let me see."

"But is there going to be trouble?"

"Yes"

"What sort?"

"Like my anger if you have lost one of those legos."

"Oh"

Suffice it to say, the lego was lost and the house is still here.