23. Sheldon's enjoyment of Penny's comfortable new armchair is shattered when he discovers the disturbing truth about the provenance of the furniture item. Where does Penny say the chair came from?
From Quiz "Big Bang Theory": Cooperisms from Season 5
Answer:
Off the street
In "The Infestation Hypothesis", Sheldon is actually complimentary of Penny's new chair until he discovers where it came from. "It aligns the lumbar, cradles the coccyx, bounces the buttocks," he informs Penny with approval. "Well, I'm glad you like it," Penny replies. "I still can't get over the fact someone just threw it away." These words land on Sheldon like a ton of bricks. "What?" he says, with a concerned look on his face. "Yeah," explains Penny, "it was just sitting on the street. I paid a homeless guy $10 just to help me get it up here." Sheldon springs out of the chair in fright. "Oh dear," he repeats, while simultaneously removing his sweater. "I've been sitting in garbage."
Sheldon makes it his mission to get Penny to get rid of the "Chair of Death" but his efforts prove futile. He then impresses on Amy to intercede on his behalf. "I was hoping she might listen to you about the dangers of owning unhygienic furniture," he explains. "Sheldon," replies Amy, "just because you have a focus on the cleanliness bordering on the psychotic doesn't mean I have to participate." Sheldon asks Amy to name her price, so she tells him to kiss her where she's "never been kissed before", but the request is lost on Sheldon. "You mean like Salt Lake City?" Frustrated, Amy agrees to talk to Penny. While doing so, Amy is bitten by some animal that has made the chair its home, and the two girls run screaming out of the apartment and down the stairs. The episode ends with Howard and Raj claiming the chair from the street outside the building so that Raj will have somewhere to sit in Leonard and Sheldon's apartment.