"Say I wanted to make a car out of play-dough, what would be the best way to go about that?"
"You wouldn't want to do that. Better to use metal."
"Yes, that's so self-evident that it doesn't warrant mentioning, but say I wanted to anyway, what would be the best way to do it?"
"But metal and plastic are better for making cars!"
"Yeah, I know, but what if?"
"You wouldn't want to do that."
"*sighs and writes dialogue to parody the situation*"