Ha ha, nice. I also have a few personal favorite scenes like that. If I think of some soon, will post them here. Thanks for those tips.
Here is one:
The scene between (actors) Jack Nicholson and Tom Cruise in which Tom tells Jack "I'm not your son, and you're under arrest, you $#%#%@^!" is a good one. I forget the name of the film though.
Another one is the scene in the movie Julius Caesar (maybe based on some classical novel about him, possibly by Shakespeare?), which occurs just before his death. Powerful performances by both the actor playing Caesar and other Roman officials of the time.
He also played the title role in Barabbas.