Who are you looking at?
The last line in the film. This gives Richard Burton's middle class roots away, and with other factors illustrates the woefull miscasting of him in this role. Vic Dakin would never have pronounced his 'H's' or 'G's' or the present indicative plural 'are'. It sounds much more 'East End' with those left out. Try it!
"Oo you lookin' at"? is much more 'back street' Stepney, Whitechapel or even Sarf' Londin (South London).