Penny is in financial difficulties and might even need to find a new place to live. After discussing this with her, Sheldon does the logical thing and lends her some money which she can repay at her leisure. When Leonard learns about Penny's problems, he tries to help her cut her expenses, and in the process learns that her ex-boyfriend Kurt owes her $1,800. Without telling Penny, Leonard and the guys go to Kurt's place to recover the money. They are unsuccessful, though Kurt writes "I owe Penny $1800, Kurt" on Leonard's forehead in indelible ink. Penny later repays Sheldon after Kurt unexpectedly repays her but, much to Leonard's disappointment, Kurt did not tell Penny about Leonard's visit, instead taking the opportunity to try to get back together with her.