No, Really, There Is Nothing in the Basement

"Honey, what is that sound?"
"What sound? I don't hear anything."
"That sound coming from the basement."
"What does it sound like?"
"I don't know, but it almost sounds like a person, only muffled slightly."
"Ha ha ha! Oh yeah! I kidnapped somebody and have them gagged in the basement!"
"Well, that isn't really what I..."
"And I'm probably carrying this knife because I was just about to go down slowly slice them to death! Ridiculous!"
"Why do you have that knife?"
"Uhhhhh, no reason! No reason at all!"
"Okaaaay."
"Um, I'll just go and check out that basement now."