The Apartment (1960)
A:      Dr. Dreyfuss (Jack Kruschen)
B:      C. C. Baxter (Jack Lemmon)
C:      Jeff Sheldrake (Fred MacMurray)

A:       I don't know what you did to that girl in there, and don't tell me, but it was bound to happen, the way you carry on.  Live now, pay later.  Diners Club.  Why don't you grow up, Baxter?  Be a mensch.  You know what that means? 
B:       I'm not sure.
A:       A mensch is human being. 

[Baxter's last day at the company]       
C:       Say, Baxter you gave me the wrong key. 
B:       No, I didn't.
C:       But this is the key to the executive washroom.
B:       That's right, Mr. Sheldrake.  I won't be needing it because I'm all washed up around here.
C:       What's gotten into you, Baxter?
A:       Just following doctor's orders.  I've decided to become a mensch.  You know what that means?  A human being.
C:       Now, hold on, Baxter...
B:       Save it.  The old payola won't work anymore.  Goodbye, Mr. Sheldrake.