Penny asks a favor of Leonard and Sheldon: to let the furniture delivery men into her apartment when they make the delivery of her recent purchase. She gives them a key to her apartment for this task. Leonard and Sheldon regret agreeing to do so when first the delivery men will not carry the delivery up the four flights of stairs, and second when they see the pigsty that is Penny's apartment, which just does not sit right with Sheldon's orderly attitude. Penny also ends up regretting asking them when Sheldon uses the key to sneak into her apartment at night when she is sleeping to tidy up, a task in which Leonard participates. Can Penny ever forgive them for violating her personal space, regardless of how immaculate the apartment looks?