There have been some very good scenes mention and I can think of many more like Steve McQueen in Papillion when he is arranging the escape and meets the leper smoking the cigar and he hesitantly takes a puff of the leper’s cigar.
The leper says “How did you know I was dry?” He didn’t; cool Steve move.

My most memorial movie scene from to Kill a Mockingbird is at the end of Tom Robinson’s trial and the courtroom is empty except the balcony where black members of the community remained.
Atticus Finch lost the trial for an innocent black man, dejected he slowly walks out of the courtroom. The people remaining in the balcony all stand showing their respect for him has he walks out. Powerful stuff.