Okay, some of those are just to tough too remove, although as a toddler I'm told I insisted my father remove skin from grapes before I would eat them. Come to think of it, if someone would do that for me sixty years later, I wouldn't turn it down.

Some of the skins I won't eat:

sweet potato, cucumber, apple, chicken, eggplant, turnip.

Some of the skins nobody eats (correct me if I'm wrong):

banana (although I did try smoking it in the 60's - thank you Donavan), winter squash.