In the title of a John Osborne play, it's what you "Look Back in"
The success of his 
1956 play Look Back in Anger transformed English .... Based on its title, Miller 
suggested Osborne's work; Olivier tried to dissuade... [DOC] [TLE] Look Back in Anger - Wikipedia [PAR] Look Back in Anger (1956) is a play by John Osborne.