Quote:
go bananas . . . To be or go crazy; to lose one's mind; to get excited.
Example:
Come quick! Your brother has gone bananas.
Etymology:
This saying comes from 20th century America. Bananas are the food most associated with monkeys. When people think of monkeys ("monke business", "more fun than a barrelful of monkeys," etc.) they think of silly, uncontrolled behavior. If a person is in a weird mood because he or she feels frustrated or bored with a situation, he or she might "go bananas" and start acting like a monkey.
Synonyms: freak out, go ape, go ballistic
Belinsky, Natalia,