A Hard Day's Night (1964)
Robin Ray: T.V. Floor Manager
[the Beatles are late for a rehersal]
T.V. Floor Manager : They'll be here.
T.V. Director : Yes, well, if they aren't on this stage in precisely thirty seconds there'll be trouble? Do you hear me? Trouble.
[exactly three seconds after he stops speaking, the Beatles calmly amble on stage]
John : [to director] Standin' around, hey? Some people have it dead easy.