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Bananas were an Earth fruit. They were a good source of potassium (TV: The Doctor Dances) and vitamins. (AUDIO: Ship in a Bottle) They also contained vasoactive amines, which made some people (such as Toshiko Sato) vomit. (TV: Something Borrowed) Bananas were commonly associated with monkeys. (TV: Ghost Light)
On Space Station Camera, the Sixth Doctor found a banana whilst searching his pockets for piece of wire. He gave the banana to Peri, who later started to eat it, but gave up when the sight of a dead Androgum made her feel sick. (TV: The Two Doctors)
The War Doctor used a molecular fruit bomb to transform the factories of Villengard into a banana grove to prevent it from supplying weapoins to Daleks, and took time to enjoy a Banana daiquiri. (COMIC: The Whole Thing's Bananas)
The Ninth Doctor also expressed his fondness for bananas and briefly switched Jack's sonic blaster with one from Villengard to stop him from shooting at Jamie. (TV: The Doctor Dances) This incident caused Jack to joke that the Doctor had a "bananas only" policy, after the Doctor blew up his spare blaster. (COMIC: Weapons of Past Destruction) The Ninth Doctor also used a banana as a pretend weapon during an exploit within a Utopia window. (AUDIO: I Was Churchill's Double)
In his tenth incarnation, the Doctor still liked bananas. He claimed that while partying with Madame de Pompadour in 18th century France, he might have invented the banana daiquiri several centuries early. He also offered Rose the advice, "Always bring a banana to a party". (TV: The Girl in the Fireplace) He also liked banana milkshakes. (TV: Smith and Jones) When he tried to stop Sky Silvestry from copying him, one of the things he mentioned was a banana. (TV: Midnight) During a visit to Blackwood Falls, the Tenth Doctor ate two banana splits in quick succession. (PROSE: Forever Autumn) He described a "Banana Surprise". (PROSE: Martha in the Mirror) Once, when expecting to land on a sunny beach, he emerged from the TARDIS with an inflatable banana. (PROSE: Snowglobe 7) While searching through the the Doctor's coat, Rose found a banana. (PROSE: The Price of Paradise) In Twycross, the Doctor used bananas to lure some escaped monkeys into the TARDIS so he could return them to the zoo. (COMIC: Untitled)
When the TARDIS entered conceptual space, the Eleventh Doctor said "Imagine a banana - or anything curved - actually, don't, because it's not curved or like a banana. Forget the banana!" to Rory in an attempt to explain. (TV: Space) During a visit to ancient Egypt, he overturned a stall selling bananas while he and his companions were being chased. (COMIC: Assimilation²) In 1938 Berlin, he switched Melody Pond's gun with a banana to foil one of her attempts to kill him. (TV: Let's Kill Hitler)
When Ianto Jones was explaining automatic doors at the supermarket to Diane Holmes, John Ellis and Emma-Louise Cowell, the women were distracted when they spotted bananas. They were very excited to see so many on display, indicating bananas were difficult to come by in December 1953. (TV: Out of Time)