Surprising uses for banana peel

A banana is one of the original fast foods, they even come in their own wrapping.  But once we've eaten that banana then what to do with the skins, apart from throwing them into the bin?

My father used to have a banana every day with his breakfast and always spread the banana peel around his roses, saying that this was good for them.  Something to do with the potassium ensuring bigger blooms apparently (see: http://gardening.knoji.com/potassium-roses-bigger-blooms-with-banana-peels/).  

And there are a few more uses for unwanted banana peel: insect bites, bruises, teeth whitening, aphid deterrent and even helps with wrinkles (see: 
http://www.wisebread.com/curing-warts-removing-splinters-and-19-other-bizarre-uses-for-banana-peels)