<P> "Lucky Penny" is the 15th episode in the second season of the television series How I Met Your Mother and 37th overall . It originally aired on February 12, 2007 . </P> <Table> <Tr> <Td> </Td> <Td> This section's plot summary may be too long or excessively detailed . Please help improve it by removing unnecessary details and making it more concise . (May 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section's plot summary may be too long or excessively detailed . Please help improve it by removing unnecessary details and making it more concise . (May 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> Ted and Robin are running through the airport, trying to catch a plane to Chicago, where Ted has an interview with a large architecture firm for the job of running the company's New York branch . As they reach their gate, the attendant tells them they cannot get on the flight . They explain that Ted had to attend a court date that morning for jumping a subway turnstile, and she asks them to wait while she talks with the flight . While they wait, Robin suggests that their lateness was in fact Barney's fault . </P>

Who dropped the penny in how i met your mother