What ARE these?

This is a cry for help.  I'm trying to figure out what the below plants are.  Well, actually, not so much the one on the right.  I learned that it is a Poke Berry, and that you can't eat them.  Which is a dern shame because we have roughly 347 of them growing nearby.  The one on the left, however, is a mystery plant.  It might just be a weed, and I'm definitely not going to eat it or anything, but now I just have to know.

Mystery leaf & fruit (left), Poke berries starting to ripen (right)

I know the fruit looks kind of like a blueberry, but it's larger (almost the size of a nickel) and I kid you not, resembles a tiny blue squash.

This is the inside.  It smells kind of like cucumber?  I have been researching for hours and got nothing!  If you have any ideas, clues, or resources, please send them my way!