The Bananas are supporting characters who appear in the the episodes "The Exploding Orange" and "Tough Enough" as a flashback. They were seen trying to help Orange with his hiccups. After a number of attempts to cure Oranges hiccups and keep him from exploding, all hope is apparently lost, until suddenly a gorilla breaks into the kitchen and eats the two bananas alive (which was foreshadowed by the headline on Kiwi's newspaper, claiming that a gorilla had escaped from a zoo), scaring Orange so much that he loses his hiccups.
Annoying Orange Wiki