Ahhhhh Hahahahaha.......It's not right to assume that all monkeys would go crazy for a banana. As a relative of one, I'm quite offended. Instead, I'd like to suggest a new, monkey-free [*] & banana packed origin to the phrase: 'going bananas'.
http://www.youtube.com/watch?v=Of90cKxSeuw
[*]Debatable
Here's the best answer I found...
Everybody knows what "going bananas" means: you've just turned plain cuckoo. But what are the origins of the phrase? Strangely, even the most authoritative source on Anglo etymology, The Oxford English Dictionary, isn't sure. The first known usage of the term has been credited to a 1968 academic publication, which noted that Kentucky college students were saying it.
http://discovolonte.typepad.com/discovolonte/2007/12/the-mystery-of.html#more
English has a very small number of swear words compared to many languages
No, I think they cover 100% of them, sometimes all in the same movie. Perhaps 110%, I wouldn't be surprised if Hollywood writers are the source of new ones. In 1972 George Carlin listed the "seven dirty words" that were forbidden on TV and although it's a little imprecise in order to fit the meter of his chanting delivery, it's surprisingly complete and hasn't expanded since then. When you consider that Hugo Chávez could call George Bush a pendejo (pubic hair) and get titillated nods of acknowledgment from a majority of the people in the Western Hemisphere including several U.S. states, we anglophones start to feel very constrained by our tiny vocabulary of dirty words.So, what we watch in Hollywood movies must be 50% of the swear words said by Anglophones?
We don't even have "bollocks," whatever those are.. . . . while we have to make do with shit, fuck, cunt, bollocks and asshole...
Do cuckoos like bananas?Everybody knows what "going bananas" means: you've just turned plain cuckoo.