1. Go bananas

• Meaning: To become very angry, crazy or annoyed
• E.g. She’ll go bananas if she sees the house in this (dirty) condition.

2. Second banana

• Meaning: A “second banana” is a subordinate, and the “top banana” is the leader.
• E.g. I generally don't mind playing second banana when I'm with such a legendary comedian, but it would be nice to be the one getting all the laughs once in a while.

3. Top banana

• Meaning: The “top banana” is the leader.
• E.g. You’ll have to ask the top banana. He’s out right now.