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Remember the previous time there is a news, said that a tourist in the scenic area encountered monkeys to eat, tourists dodge after the monkey "push" the next cliff. It can be seen that the monkeys see food, especially the things they like to eat will be emotionally excited or even out of control. The go bananas in English can be used to describe them in the right place.
Bananas, fragrant and sweet banana almost everyone likes to eat, but the banana love the most crazy may be the monkeys. Monkeys see bananas will be too excited to get carried away, also called and jump. Go bananas This idiom comes from this.
Of course it is not necessarily used to describe monkeys. If someone is bouncing off, shouting, or even behaving like a monkey when they see a banana in a particular situation, the person must be emotionally out of control, and we can say he is going bananas.
Let's look at one more example:
My Little sister spends all she time listening to loud music, talking on the phone, or looking at herself in the mirror in stead of studying, my parents is going bananas at her.
My sister is not to open the music very loudly all day, is to call, or to look in the mirror, anyway is not study. My parents are going to be mad at her.