At Gilderoy Lockhart’s book signing at Flourish and Blotts, Lucius Malfoy insults Arthur Weasley for associating with Muggles (Mr. and Mrs. Granger) and Arthur lunges at Lucius. Bookshelves are disturbed in the commotion. An Encyclopedia of Toadstools hits Lucius in one eye, and Arthur sustains a cut to the lip. To no avail, Molly and the assistant manager of Flourish and Blotts plead for the men to stop fighting. Finally, Hagrid separates them. In the chaos, Lucius slips Riddle’s diary into Ginny’s cauldron (CS4).
Fred notices a happy Lockhart asking a Daily Prophet reporter if he can include the fight in his coverage of the event to make it more exciting and generate great publicity (CS4).