Looks like Pokeweed.

The berries are poisonous, but good for making dye/paint. We smashed some up when I was a kid, but my mom stopped us before we could actually smear them on anything but our fingers; we knew they were poisonous, and had no plans to ingest them, but when you're 9, mothers are paranoid...

The leaves are also toxic, but you can make poke salad (a tasty dish, I've heard) by boiling them in at least 3 changes of water to detoxify... wasn't interested, then or now.