It's kind of pretty, and grows in shade... I think grape, too. You might post this over on the "Name that Plant" forum,... I'm curious.-Bonnie

I would be surprised if this is any type of grape vine. I didn't speak up earlier because I don't know what else it might be...

Mike

could be a weed that grows and looks almost exactly like grape vines. I have them in my yard and just pull them out, but they are runner roots. If you want to wait and see if it does produce grapes, you'll know for sure

There is a wild grape that is considered weedy, although some leave it for wildlife use and even use or eat the fruit.

Here is a link that might be useful: Wild grape

If the leaves are raspy and the tendrils forked, I would go with Echinocystis or Sicyos, otherwise probably Menispermum.

I still don't know what this one is, but thanks to everyone who offered suggestions! :)