Quoting Anthony Lombardi

"Though, the best acting in the entire trilogy, AND that I've ever seen on camera in any movie is most definately Fredo's "I'm smart" scene in The Godfather, Part II. His facial expression, the way he's shaking, his motions, his voice. You can feel his pain, his hurt... How he feels he was betrayed. You can feel how he just wanted to get some credit and recognition, but most of all you feel his remorse and regret. Powerful, emotional, and captivating. I can't help but get teary eyed and choked up everytime I see it."

You might be interested to know that the bouncy chair that Cazale was sitting in had an important role to play in the brilliance of that scene. In the GFII DVD FFC says that the chair helped a lot with how he wanted Cazale to act that scene out.

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"....never take sides with anyone against the family again..ever"