Ducky has heard of the old belief that whoever reaches the end of the rainbow will find treasure. Little does she know that there is an even older and more widespread belief that the one who walks under the rainbow will have his sex changed.
I suppose that could form the basis of a new roleplay, "a sudden change of gender".

Although, I still see Ducky maintaining her cheerful deposition, even if she became a he.
Cera (upon seeing Ducky hallucinate): "It looks like she got into those weird tree stars again..."