Charles B. Pierce with Eastwood, who liked the story and helped Pierce develop it into "Sudden Impact" (1983), the fourth entry in Eastwood's Dirty Harry film series. Pierce was given a writer's credit for the story along with Joseph C. Stinson. Pierce is said to have written the phrase, "Go ahead, make my day," the film's most famous line, which went on to be identified as one of the ten best movie quotes of all-time by the American Film Institute. The phrase was inspired by something his father once told Pierce in his youth while encouraging his son to mow the lawn: "When
Go-Ahead London in August 2008, when a new Go-Ahead London logo was unveiled. In 2009, Transport for London invited bids for the sale of their own bus operations which ran under the East Thames Buses brand. Go-Ahead London were selected as the preferred bidder and assumed full responsibility for 10 routes and two depots in October 2009. The East Thames brand was replaced with the Go-Ahead London brand. The East Thames operations were initially absorbed under the London General arm of Go-Ahead's London business. However, after some route movements and allocation changes some of the services now run under the London Central.