I think the "banana" remains the "abstain" or "make fun of" option even in the Macintosh forums here. An apple, though, would make more sense ... 
Gatekeeper

Gatekeeper

he made a poll about which type of fruit people liked... and many people copied the thread- we had about 20 or so polls with "banana" in their option lines 
)
All of our uncontested elections, (and some of our contested ones,) run a banana option.
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